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Clopidogrel Nitroso Impurity

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Chemical Name: 5-Nitroso-4,5,6,7-tetrahydrothieno[3,2-c]pyridine
Smile: O=NN1CCC2=C(C=CS2)C1
CAT No: VS-N091243
CAS No: 2460755-43-3
Mol.F. C7H8N2OS
Mol.Wt.: 168.2
Status: Custom Synthesis


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Nitroso Phthaloyl Amlodipine

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CAT No: VS-N091001
CAS No: N/A
Mol.F.: C28H26ClN3O8
Mol.Wt.: 568
Status: Custom Synthesis

N-Nitroso Atenolol-d5

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CAT No: VS-N091002
CAS No: N/A
Mol.F.: C14H16D5N3O4
Mol.Wt.: 300.37
Status: Custom Synthesis

Nitroso Arformoterol

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CAT No: VS-N091003
CAS No: N/A
Mol.F.: C19H23N3O6
Mol.Wt.: 389.41
Status: Custom Synthesis

N-Nitroso-Atenolol

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CAT No: VS-N091004
CAS No: 134720-04-0
Mol.F.: C14H21N3O4
Mol.Wt.: 295.33
Status: Custom Synthesis

Bupropion Nitroso Impurity

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CAT No: VS-N091005
CAS No: 2763780-10-3
Mol.F.: C13H17ClN2O2
Mol.Wt.: 268.7
Status: Custom Synthesis

Buspirone Nitroso Impurity 1

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CAT No: VS-N091006
CAS No: 872826-80-7
Mol.F.: C8H11N5O
Mol.Wt.: 193.2
Status: Custom Synthesis

Bilastine Nitrosoamine Impurity 1

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CAT No: VS-N091007
CAS No: N/A
Mol.F.: C12H14N4O
Mol.Wt.: 230.27
Status: Custom Synthesis

N-NITROSO-BISOPROLOL

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CAT No: VS-N091008
CAS No: 2820170-76-9
Mol.F.: C18H30N2O5
Mol.Wt.: 354.4
Status: Custom Synthesis

Mono-Nitroso-Clonidine

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CAT No: VS-N091009
CAS No: 148950-49-6
Mol.F.: C9H8Cl2N4O
Mol.Wt.: 259.1
Status: Custom Synthesis

N-Nitroso Ciprofloxacin

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CAT No: VS-N091010
CAS No: 864443-44-7
Mol.F.: C17H17FN4O4
Mol.Wt.: 360.3
Status: Custom Synthesis

N-NITROSO-CINACALCET

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CAT No: VS-N091011
CAS No: N/A
Mol.F.: C22H21F3N2O
Mol.Wt.: 386.4
Status: Custom Synthesis

N-Nitroso Dabigatran Etexilate

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CAT No: VS-N091012
CAS No: 2892260-29-4
Mol.F.: C34H40N8O6
Mol.Wt.: 656.7
Status: Custom Synthesis

DABIGATRAN NITROSO IMPURITY 18

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CAT No: VS-N091013
CAS No: N/A
Mol.F.: C18H19N5O6
Mol.Wt.: 401.4
Status: Custom Synthesis

Dabigatran Nitroso Impurity 7

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CAT No: VS-N091014
CAS No: N/A
Mol.F.: C27H25N7O4
Mol.Wt.: 511.5
Status: Custom Synthesis

Dabigatran Nitroso Impurity 3

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CAT No: VS-N091015
CAS No: N/A
Mol.F.: C10H13N3O3
Mol.Wt.: 223.2
Status: Custom Synthesis

N-Nitroso Dorzolamide

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CAT No: VS-N091016
CAS No: N/A
Mol.F.: C10H15N3O5S3
Mol.Wt.: 353.4
Status: Custom Synthesis

N-Nitroso Decyl aminoquat

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CAT No: VS-N091017
CAS No: N/A
Mol.F.: C19H42N3O
Mol.Wt.: 328.6
Status: Custom Synthesis

N-Nitroso Didecylamine

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CAT No: VS-N091018
CAS No: 69112-95-4
Mol.F.: C20H42N2O
Mol.Wt.: 326.6
Status: Custom Synthesis

N-Nitroso Desmopressin

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CAT No: VS-N091019
CAS No: N/A
Mol.F.: C46H63N15O13S2
Mol.Wt.: 1098.2
Status: Custom Synthesis

Dabigatran Nitrosamine Impurity

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CAT No: VS-N091020
CAS No: N/A
Mol.F.: C18H21N5O4
Mol.Wt.: 371.39
Status: Custom Synthesis

Dabigatran Amide Nitroso Impurity

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CAT No: VS-N091021
CAS No: N/A
Mol.F.: C34H39N7O7
Mol.Wt.: 657.73
Status: Custom Synthesis

Duloxetine Nitroso Impurity 2

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CAT No: VS-N091022
CAS No: 2680527-91-5
Mol.F.: C18H18N2O2S
Mol.Wt.: 326.4
Status: Custom Synthesis

N-Nitroso Edoxaban Desmethyl Impurity

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CAT No: VS-N091023
CAS No: N/A
Mol.F.: C23H27ClN8O5S : C7H8O3S
Mol.Wt.: 563.0 : 172.2
Status: Custom Synthesis

Etomidate intermediate Nitroso impurity

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CAT No: VS-N091024
CAS No: 2765007-50-7
Mol.F.: C12H16N2O3
Mol.Wt.: 236.27
Status: Custom Synthesis

N-Nitroso Edoxaban Impurity 5

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CAT No: VS-N091025
CAS No: N/A
Mol.F.: C7H7N3O3S
Mol.Wt.: 213.2
Status: Custom Synthesis

Elagolix Ethyl Ester Nitroso Impurity

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CAT No: VS-N091026
CAS No: N/A
Mol.F.: C34H33F5N4O6
Mol.Wt.: 688.7
Status: Custom Synthesis

Elagolix Nitroso Impurity

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CAT No: VS-N091027
CAS No: N/A
Mol.F.: C32H29F5N4O6
Mol.Wt.: 660.6
Status: Custom Synthesis

N-Nitroso N-Desmethyl Citalopram

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CAT No: VS-N091028
CAS No: N/A
Mol.F.: C19H18FN3O2
Mol.Wt.: 339.4
Status: Custom Synthesis

N-Nitroso Pseudoephedrine

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CAT No: VS-N091029
CAS No: 1850-88-0
Mol.F.: C10H14N2O2
Mol.Wt.: 194.2
Status: Custom Synthesis

N-Nitroso Enalapril

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CAT No: VS-N091030
CAS No: N/A
Mol.F.: C20H27N3O6
Mol.Wt.: 405.5
Status: Custom Synthesis

Dinitroso Ethambutol

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CAT No: VS-N091031
CAS No: 52322-22-2
Mol.F.: C10H22N4O4
Mol.Wt.: 262.3
Status: Custom Synthesis

N-Nitroso-Fluoxetine

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CAT No: VS-N091032
CAS No: 150494-06-7
Mol.F.: C17H17F3N2O2
Mol.Wt.: 338.3
Status: Custom Synthesis

Finerenone Nitroso Impurity

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CAT No: VS-N091033
CAS No: N/A
Mol.F.: C21H21N5O4
Mol.Wt.:  407.4
Status: Custom Synthesis

Nitrosoguanidine

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CAT No: VS-N091034
CAS No: 674-81-7
Mol.F.: CH4N4O
Mol.Wt.: 88.1
Status: Custom Synthesis

N-Nitroso Hydrochlorothiazide

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CAT No: VS-N091035
CAS No: 63779-86-2
Mol.F.: C7H7ClN4O5S2
Mol.Wt.: 326.7
Status: Custom Synthesis

N-NITROSO HYDROXYZINE IMPURITY

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CAT No: VS-N091036
CAS No: 2005-04-1
Mol.F.: C17H18ClN3O
Mol.Wt.: 315.8
Status: Custom Synthesis

N-Nitroso ketamine

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CAT No: VS-N091037
CAS No: 86144-35-6
Mol.F.: C13H15ClN2O2
Mol.Wt.: 266.7
Status: Custom Synthesis

Lapatinib Nitroso Impurity 1

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CAT No: VS-N091038
CAS No: N/A
Mol.F.: C29H25ClFN5O5S
Mol.Wt.: 610.1
Status: Custom Synthesis

N-Nitroso linezolid Impurity 1

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CAT No: VS-N091039
CAS No: N/A
Mol.F.: C16H19FN4O5
Mol.Wt.: 366.3
Status: Custom Synthesis

N-Nitroso Levofloxacin EP Impurity B

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CAT No: VS-N091040
CAS No: 1152314-62-9
Mol.F.: C17H17FN4O5
Mol.Wt.: 376.3
Status: Custom Synthesis

N-Nitroso N-Desbutyl Lumefantrine

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CAT No: VS-N091041
CAS No: N/A
Mol.F.: C26H23Cl3N2O2
Mol.Wt.: 501.8
Status: Custom Synthesis

Lenalidomide Nitroso Impurity

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CAT No: VS-N091042
CAS No: N/A
Mol.F.: C13H11N3O4
Mol.Wt.: 273.2
Status: Custom Synthesis

N-Nitroso Labetolol

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CAT No: VS-N091043
CAS No: 2820170-74-7
Mol.F.: C19H23N3O4
Mol.Wt.: 357.4
Status: Custom Synthesis

N-Nitroso S-Mirabegron

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CAT No: VS-N091044
CAS No: N/A
Mol.F.: C21H23N5O3S
Mol.Wt.: 425.5
Status: Custom Synthesis

N-Nitroso Mirabegron

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CAT No: VS-N091045
CAS No: N/A
Mol.F.: C21H23N5O3S
Mol.Wt.: 425.5
Status: Custom Synthesis

N-Nitrosomorpholine

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CAT No: VS-N091046
CAS No: 59-89-2
Mol.F.: C4H8N2O2
Mol.Wt.: 116.12
Status: Custom Synthesis

N-Nitroso Methylphenidate

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CAT No: VS-N091047
CAS No: 55557-03-4
Mol.F.: C14H18N2O3
Mol.Wt.: 262.3
Status: Custom Synthesis

N-Nitroso Metformin

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CAT No: VS-N091048
CAS No: N/A
Mol.F.: C4H10N6O
Mol.Wt.: 158.2
Status: Custom Synthesis

N-nitroso moxifloxacin

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CAT No: VS-N091049
CAS No: N/A
Mol.F.: C21H23FN4O5
Mol.Wt.: 430.43
Status: Custom Synthesis

N-Nitrosometoprolol

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CAT No: VS-N091050
CAS No: 138768-62-4
Mol.F.: C15H24N2O4
Mol.Wt.: 296.4
Status: Custom Synthesis

N-Nitroso Niraparib

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CAT No: VS-N091051
CAS No: NA
Mol.F.: C19H19N5O2
Mol.Wt.: 349.4
Status: Custom Synthesis

N-Nitroso Nortriptyline-D3

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CAT No: VS-N091052
CAS No: NA
Mol.F.: C19H17D3N2O
Mol.Wt.: 295.39
Status: Custom Synthesis

N-Nitroso Nortriptyline

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CAT No: VS-N091053
CAS No: 55855-42-0
Mol.F.: C19H20N2O
Mol.Wt.: 292.4
Status: Custom Synthesis

N-Nitroso Nebivolol D4

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CAT No: VS-N091054
CAS No: NA
Mol.F.: C22H20D4F2N2O5
Mol.Wt.: 438.5
Status: Custom Synthesis

Nifedipine Nitroso Impurity

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CAT No: VS-N091055
CAS No: NA
Mol.F.: C17H17N3O7
Mol.Wt.: 375.3
Status: Custom Synthesis

Nicardipine Nitroso Impurity

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CAT No: VS-N091056
CAS No: NA
Mol.F.: C26H28N4O7
Mol.Wt.: 508.5
Status: Custom Synthesis

N-Nitroso Nimodipine

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CAT No: VS-N091057
CAS No: NA
Mol.F.: C21H25N3O8
Mol.Wt.: 447.44
Status: Custom Synthesis

N-Nitroso-N-Desmethyl Nicardipine

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CAT No: VS-N091058
CAS No: NA
Mol.F.: C25H26N4O7
Mol.Wt.: 494.5
Status: Custom Synthesis

N-Nitroso N-Desbenzyl Nicardipine

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CAT No: VS-N091059
CAS No: NA
Mol.F.: C19H22N4O7
Mol.Wt.: 418.4
Status: Custom Synthesis

N-Nitroso-Nebivolol

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CAT No: VS-N091060
CAS No: 1391051-68-5
Mol.F.: C22H24F2N2O5
Mol.Wt.: 434.4
Status: Custom Synthesis

Palbociclib Nitroso Impurity 1

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CAT No: VS-N091061
CAS No: NA
Mol.F.: C24H28N8O3
Mol.Wt.: 476.5
Status: Custom Synthesis

n-nitroso pruclopride impurity A

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CAT No: VS-N091062
CAS No: NA
Mol.F.:  C14H17ClN4O3
Mol.Wt.: 324.8
Status: Custom Synthesis

Palbociclib Nitroso Impurity 3

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CAT No: VS-N091063
CAS No: NA
Mol.F.: C24H28N8O3
Mol.Wt.: 476.5
Status: Custom Synthesis

Palbociclib Nitroso Impurity 2

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CAT No: VS-N091064
CAS No: NA
Mol.F.: C24H27N9O4
Mol.Wt.: 505.5
Status: Custom Synthesis

N-Nitroso Perindopril

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CAT No: VS-N091065
CAS No: NA
Mol.F.: C19H31N3O6
Mol.Wt.: 397.5
Status: Custom Synthesis

N-Nitroso Perindopril IMPURITY B

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CAT No: VS-N091066
CAS No: NA
Mol.F.: C17H27N3O6
Mol.Wt.: 369.42
Status: Custom Synthesis

N-Nitroso Promethazine EP Impurity A

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CAT No: VS-N091067
CAS No: 36144-72-6
Mol.F.: C12H8N2OS
Mol.Wt.: 228.3
Status: Custom Synthesis

N-Nitroso Paracetamol

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CAT No: VS-N091068
CAS No: 146897-60-1
Mol.F.: C8H8N2O3
Mol.Wt.: 180.2
Status: Custom Synthesis

N-Nitroso Quetiapine EP Impurity B D8

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CAT No: VS-N091069
CAS No: NA
Mol.F.: C17H8D8N4OS
Mol.Wt.: 332.5
Status: Custom Synthesis

Quetiapine Nitroso EP Impurity B

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CAT No: VS-N091070
CAS No: NA
Mol.F.: C17H16N4OS
Mol.Wt.: 324.4
Status: Custom Synthesis

N-Nitroso Ramipril

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CAT No: VS-N091071
CAS No: NA
Mol.F.: C23H31N3O6
Mol.Wt.: 445.5
Status: Custom Synthesis

N-Nitroso Rasagiline-D4

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CAT No: VS-N091072
CAS No: NA
Mol.F.: C12H8D4N2O
Mol.Wt.: 204.12
Status: Custom Synthesis

Ribociclib Nitroso Impurity 1

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CAT No: VS-N091073
CAS No: NA
Mol.F.: C23H29N9O2
Mol.Wt.: 463.5
Status: Custom Synthesis

Ribociclib Nitroso Impurity 3

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CAT No: VS-N091074
CAS No: NA
Mol.F.: C23H29N9O2
Mol.Wt.: 463.5
Status: Custom Synthesis

Mononitroso Rilpivirine - I

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CAT No: VS-N091075
CAS No: NA
Mol.F.: C22H17N7O
Mol.Wt.: 395.4
Status: Custom Synthesis

Mononitroso Rilpivirine - II

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CAT No: VS-N091076
CAS No: NA
Mol.F.: C22H17N7O
Mol.Wt.: 395.4
Status: Custom Synthesis

N-Nitroso-Rasagiline

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CAT No: VS-N091077
CAS No: 2470278-90-9
Mol.F.: C12H12N2O
Mol.Wt.: 200.2
Status: Custom Synthesis

Rivaroxaban N-Nitroso Amide Impurity

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CAT No: VS-N091079
CAS No: NA
Mol.F.: C18H19ClN4O5S
Mol.Wt.: 438.9
Status: Custom Synthesis

N-Nitroso Ranolazine

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CAT No: VS-N091080
CAS No: NA
Mol.F.: C24H32N4O5
Mol.Wt.: 456.5
Status: Custom Synthesis

Sunitinib Nitroso Impurity 1

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CAT No: VS-N091081
CAS No: NA
Mol.F.: C16H26N4O4
Mol.Wt.: 338.41
Status: Custom Synthesis

Sunitinib Nitroso Impurity 2

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CAT No: VS-N091082
CAS No: NA
Mol.F.: C12H18N4O3
Mol.Wt.: 266.3
Status: Custom Synthesis

Sunitinib Nitroso Impurity 3

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CAT No: VS-N091083
CAS No: NA
Mol.F.: C11H18N4O2
Mol.Wt.: 238.29
Status: Custom Synthesis

N-Nitroso Salbutamol

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CAT No: VS-N091084
CAS No: 2919946-71-5
Mol.F.: C13H20N2O4
Mol.Wt.: 268.31
Status: Custom Synthesis

Sitagliptin Nitroso Impurity-D4

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CAT No: VS-N091085
CAS No: NA
Mol.F.: C6H2D4F3N5O
Mol.Wt.: 225.17
Status: Custom Synthesis

N-Nitroso-Sertraline

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CAT No: VS-N091086
CAS No: NA
Mol.F.: C17H16Cl2N2O
Mol.Wt.: 335.2
Status: Custom Synthesis

N-Nitroso Sitagliptin Impurity

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CAT No: VS-N091087
CAS No: 2892260-32-9
Mol.F.: C6H6F3N5O
Mol.Wt.: 221.1
Status: Custom Synthesis

N-Nitroso Trimetazidine

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CAT No: VS-N091088
CAS No: N/A
Mol.F.: C14H21N3O4 : HCl
Mol.Wt.: 295.3 : 36.5
Status: Custom Synthesis

N-Nitroso Tigecycline

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CAT No: VS-N091089
CAS No: N/A
Mol.F.: C29H38N6O9
Mol.Wt.: 614.66
Status: Custom Synthesis

N-Nitroso Trimetazidine-D9

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CAT No: VS-N091090
CAS No: N/A
Mol.F.: C14H13D9ClN3O4
Mol.Wt.: 340.85
Status: Custom Synthesis

N-Nitroso Tamsulosin-D4

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CAT No: VS-N091091
CAS No: N/A
Mol.F.: C20H23D4N3O6S
Mol.Wt.: 441.53
Status: Custom Synthesis

N-Nitroso Tamsulosin Impurity

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CAT No: VS-N091092
CAS No: 2892260-31-8
Mol.F.: C20H27N3O6S
Mol.Wt.: 437.5
Status: Custom Synthesis

Vonoprazan Nitroso Impurity

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CAT No: VS-N091093
CAS No: 2932441-73-9
Mol.F.: C17H15FN4O3S
Mol.Wt.: 374.4
Status: Custom Synthesis

N -Nitroso valsartan Impurity 1

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CAT No: VS-N091094
CAS No: 2254485-68-0
Mol.F.: C19H20N6O3
Mol.Wt.: 380.4
Status: Custom Synthesis

N-Nitroso Varenicline

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CAT No: VS-N091095
CAS No: 2755871-02-2
Mol.F.: C13H12N4O
Mol.Wt.: 240.3
Status: Custom Synthesis

N-Nitroso Vildagliptin

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CAT No: VS-N091096
CAS No: N/A
Mol.F.: C17H24N4O3
Mol.Wt.: 332.4
Status: Custom Synthesis

N-Nitroso-Vildagliptin amide Impurity

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CAT No: VS-N091097
CAS No: N/A
Mol.F.: C17H26N4O4
Mol.Wt.: 350.42
Status: Custom Synthesis

N-Nitroso Zanubrutinib

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CAT No: VS-N091098
CAS No: N/A
Mol.F.: C27H28N6O4
Mol.Wt.: 500.6
Status: Custom Synthesis

N-Nitroso Zolmitriptan EP Impurity G (possibility 1)

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CAT No: VS-N091099
CAS No: N/A
Mol.F.: C15H18N4O3
Mol.Wt.: 302.3
Status: Custom Synthesis

N-Nitroso-desmethyl Escitalopram 

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CAT No: VS-N091100
CAS No: N/A
Mol.F.: C19H18FN3O2
Mol.Wt.: 339.37
Status: Custom Synthesis

Formoterol intermediate nitroso impurity

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CAT No: VS-N091101
CAS No: N/A
Mol.F.: C17H20N2O2
Mol.Wt.: 284.36
Status: Custom Synthesis

Sertraline Nitroso Impurity

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CAT No: VS-N091102
CAS No: 3006789-98-3
Mol.F.: C17H16Cl2N2O
Mol.Wt.: 335.23
Status: Custom Synthesis

N-Nitroso Duloxetine EP Impurity B

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CAT No: VS-N091103
CAS No: 2418708-78-6
Mol.F.: C8H12N2O2S
Mol.Wt.: 200.3
Status: Custom Synthesis

N-Nitroso Vortioxetine Impurity-2

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CAT No: VS-N091104
CAS No: N/A
Mol.F.: C18H21N3OS
Mol.Wt.: 327.45
Status: Custom Synthesis

N-Nitroso Vortioxetine Impurity-3

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CAT No: VS-N091105
CAS No: N/A
Mol.F.: C18H21N3O2S
Mol.Wt.: 343.45
Status: Custom Synthesis

N-Nitroso Vortioxetine

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CAT No: VS-N091106
CAS No: N/A
Mol.F.: C18H21N3OS
Mol.Wt.: 327.45
Status: Custom Synthesis

N-NITROSO OXCARBAZEPINE EP IMPURITY C

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CAT No: VS-N091107
CAS No: N/A
Mol.F.: C14H10N2O2
Mol.Wt.: 238.25
Status: Custom Synthesis

N-Nitroso N-Desmethyl Olopatadine

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CAT No: VS-N091108
CAS No: N/A
Mol.F.: C20H20N2O4
Mol.Wt.: 352.39
Status: Custom Synthesis

N-Nitroso Bumetanide

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CAT No: VS-N091109
CAS No: 2490432-02-3
Mol.F.: C17H19N3O6S
Mol.Wt.: 393.4
Status: Custom Synthesis

N-Nitroso paroxetine Impurity

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CAT No: VS-N091110
CAS No: 2361294-43-9
Mol.F.: C19H19FN2O4
Mol.Wt.: 358.4
Status: Custom Synthesis

N-Nitroso Quinapril

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CAT No: VS-N091111
CAS No: 2922985-13-3
Mol.F.: C25H29N3O6
Mol.Wt.: 467.52
Status: Custom Synthesis

Vildagliptin N-Nitroso-L-Prolinaminde

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CAT No: VS-N091112
CAS No: 79108-51-3
Mol.F.: C5H9N3O2
Mol.Wt.: 143.1
Status: Custom Synthesis

N-Nitroso Carvedilol

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CAT No: VS-N091113
CAS No: 2248746-67-8
Mol.F.: C24H25N3O5
Mol.Wt.: 435.5
Status: Custom Synthesis

Carvedilol Nitroso Impurity 2

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CAT No: VS-N091114
CAS No: N/A
Mol.F.: C24H25N3O5
Mol.Wt.: 435.5
Status: Custom Synthesis

N-Nitroso-Desloratadine

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CAT No: VS-N091115
CAS No: 1246819-22-6
Mol.F.: C19H18ClN3O
Mol.Wt.: 339.82
Status: Custom Synthesis

N-Nitroso Lisinopril

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CAT No: VS-N091116
CAS No: 519175-80-5
Mol.F.: C21H30N4O6
Mol.Wt.: 434.5
Status: Custom Synthesis

N-Nitroso Ranolazine USP Related Compound C

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CAT No: VS-N091117
CAS No: N/A
Mol.F.: C14H20N4O2
Mol.Wt.: 276.3
Status: Custom Synthesis

N-Nitroso-Silodosin

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CAT No: VS-N091118
CAS No: N/A
Mol.F.: C25H31F3N4O5
Mol.Wt.: 524.5
Status: Custom Synthesis

N-Nitroso Varenicline Ortho Dinitro Impurity

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CAT No: VS-N091119
CAS No: 2803960-63-4
Mol.F.: C11H10N4O5
Mol.Wt.: 278.2
Status: Custom Synthesis

N-Nitroso Duloxetine

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CAT No: VS-N091120
CAS No: N/A
Mol.F.: C18H18N2O2S
Mol.Wt.: 326.4
Status: Custom Synthesis

N-Nitroso Lacosamide

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CAT No: VS-N091121
CAS No: N/A
Mol.F.: C13H17N3O4
Mol.Wt.: 279.29
Status: Custom Synthesis

N-nitroso-desmethyl-tramadol

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CAT No: VS-N091122
CAS No: N/A
Mol.F.: C15H22N2O3
Mol.Wt.: 278.35
Status: Custom Synthesis

N-Nitroso dobutamine

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CAT No: VS-N091123
CAS No: N/A
Mol.F.: C18H22N2O4
Mol.Wt.: 330.4
Status: Custom Synthesis

N-Nitroso Clozapine

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CAT No: VS-N091124
CAS No: 156632-03-0
Mol.F.: C18H18ClN5O
Mol.Wt.: 355.8
Status: Custom Synthesis

N-NITROSO-TRIENTINE-I

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CAT No: VS-N091125
CAS No: N/A
Mol.F.: C6H17N5O
Mol.Wt.: 175.24
Status: Custom Synthesis

N-Nitroso Salmeterol

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CAT No: VS-N091126
CAS No: N/A
Mol.F.: C25H36N2O5
Mol.Wt.: 444.57
Status: Custom Synthesis

N-Nitroso Esomeprazole

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CAT No: VS-N091127
CAS No: N/A
Mol.F.: C16H16N4O3S
Mol.Wt.: 344.4
Status: Custom Synthesis

N-Nitroso Famotidine I

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CAT No: VS-N091128
CAS No: N/A
Mol.F.: C8H14N8O3S3
Mol.Wt.: 366.43
Status: Custom Synthesis

N-Nitroso Famotidine II

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CAT No: VS-N091129
CAS No: N/A
Mol.F.: C8H14N8O3S3
Mol.Wt.: 366.43
Status: Custom Synthesis

N-Nitroso Lansoprazole

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CAT No: VS-N091130
CAS No: N/A
Mol.F.: C16H13F3N4O3S
Mol.Wt.: 398.36
Status: Custom Synthesis

N-Nitroso Desmethyl Edoxaban

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CAT No: VS-N091131
CAS No: N/A
Mol.F.: C23H27ClN8O5S
Mol.Wt.: 563.03
Status: Custom Synthesis

N-Nitroso Nintedanib

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CAT No: VS-N091132
CAS No: N/A
Mol.F.: C31H32N6O5
Mol.Wt.: 568.6
Status: Custom Synthesis

Hydralazine Nitroso Impurity

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CAT No: VS-N091133
CAS No: N/A
Mol.F.: C8H7N5O
Mol.Wt.: 189.18
Status: Custom Synthesis

N-Nitroso Cyclobenzaprine USP Related Compound B

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CAT No: VS-N091134
CAS No: N/A
Mol.F.: C19H18N2O
Mol.Wt.: 290.37
Status: Custom Synthesis

N-Nitroso Vortioxetine

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CAT No: VS-N091135
CAS No: 2925447-38-5
Mol.F.: C18H21N3OS
Mol.Wt.: 327.4
Status: Custom Synthesis

N-Nitroso Teneligliptin

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CAT No: VS-N091136
CAS No: NA
Mol.F.: C22H29N7O2S
Mol.Wt.: 455.6
Status: Custom Synthesis

N-Nitroso-Sotalol

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CAT No: VS-N091137
CAS No: 134720-07-3
Mol.F.: C12H19N3O4S
Mol.Wt.: 301.4
Status: Custom Synthesis

N-Nitroso Sildenafil

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CAT No: VS-N091138
CAS No: NA
Mol.F.: C22H29N7O5S
Mol.Wt.: 503.6
Status: Custom Synthesis

N-Nitroso Safinamide

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CAT No: VS-N091139
CAS No: 2657645-00-4
Mol.F.: C17H18FN3O3
Mol.Wt.: 331.3
Status: Custom Synthesis

N-Nitroso N-Desmethyl Doxepin Impurity

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CAT No: VS-N091140
CAS No: NA
Mol.F.: C18H18N2O2
Mol.Wt.: 294.4
Status: Custom Synthesis

N-Nitrosoiminodiacetic Acid

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CAT No: VS-N091141
CAS No: 25081-31-6
Mol.F.: C4H6N2O5
Mol.Wt.: 162.1
Status: Custom Synthesis

N,C-Didesmethyl Doxylamine N-Nitroso

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CAT No: VS-N091142
CAS No: NA
Mol.F.: C15H17N3O2
Mol.Wt.: 271.32
Status: Custom Synthesis

N-Nitroso-N-Methyl-Taurine

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CAT No: VS-N091143
CAS No: NA
Mol.F.: C3H8N2O4S
Mol.Wt.: 168.17
Status: Custom Synthesis

Praziquantel Nitroso Impurity 1

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CAT No: VS-N091144
CAS No: 115822-46-3
Mol.F.: C12H13N3O2
Mol.Wt.: 231.3
Status: Custom Synthesis

N-Nitroso Diltiazem EP Impurity D

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CAT No: VS-N091145
CAS No: NA
Mol.F.: C21H23N3O5S
Mol.Wt.: 429.5
Status: Custom Synthesis

N-Nitroso Desmethyl Azelastine

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CAT No: VS-N091146
CAS No: NA
Mol.F.: C21H21ClN4O2
Mol.Wt.: 396.9
Status: Custom Synthesis

N-Nitroso Amiodarone EP Impurity B

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CAT No: VS-N091147
CAS No: 678982-38-2
Mol.F.: C23H24I2N2O4
Mol.Wt.: 646.3
Status: Custom Synthesis

N-Nitroso-Cyanoguanidine

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CAT No: VS-N091148
CAS No: NA
Mol.F.: C2H3N5O
Mol.Wt.: 113.08
Status: Custom Synthesis

N-Nitroso Clopidogrel EP Impurity F

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CAT No: VS-N091149
CAS No: NA
Mol.F.: C15H15ClN2O3S
Mol.Wt.: 338.8
Status: Custom Synthesis

N-Nitroso Ciprofloxacin EP Impurity F

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CAT No: VS-N091150
CAS No: NA
Mol.F.: C17H18N4O5
Mol.Wt.: 358.13
Status: Custom Synthesis

N-Nitroso Cyclophosphamide

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CAT No: VS-N091151
CAS No: NA
Mol.F.: C7H14Cl2N3O3P
Mol.Wt.: 290.08
Status: Custom Synthesis

N-Nitroso Atropine EP Impurity B

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CAT No: VS-N091152
CAS No: 55855-45-3
Mol.F.: C16H20N2O4
Mol.Wt.: 304.3
Status: Custom Synthesis

N-Nitroso desmethyl Zopiclone

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CAT No: VS-N091153
CAS No: NA
Mol.F.: C₁₆H₁₄ClN₇O₄
Mol.Wt.: 403.78
Status: Custom Synthesis

N-Nitroso Desmethyl Prochlorperazine

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CAT No: VS-N091154
CAS No: 109095-35-4
Mol.F.: C19H21ClN4OS
Mol.Wt.: 388.91
Status: Custom Synthesis

Acalabrutinib Nitroso Impurity 1

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CAT No: VS-N091155
CAS No: NA
Mol.F.: C22H20N8O2
Mol.Wt.: 428.5
Status: Custom Synthesis

N-methyl-N-(2,3,4,5,6-pentahydroxyhexyl)nitrous amide

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CAT No: VS-N091156
CAS No: 62137-31-9
Mol.F.: C7H16N2O6
Mol.Wt.: 224.21
Status: Custom Synthesis

N-Nitroso N-Desmethyl Methylene Blue

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CAT No: VS-N091157
CAS No: NA
Mol.F.: C15H15ClN4OS
Mol.Wt.: 334.82
Status: Custom Synthesis

N-Nitroso Benazepril

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CAT No: VS-N091158
CAS No: NA
Mol.F.: C24H27N3O6
Mol.Wt.: 453.5
Status: Custom Synthesis

Nintedanib Nitroso Impurity 2

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CAT No: VS-N091159
CAS No: 2490403-92-2
Mol.F.: C13H17N5O4
Mol.Wt.: 307.31
Status: Custom Synthesis

Flecainide Nitroso Impurity

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CAT No: VS-N091160
CAS No: 2901109-58-6
Mol.F.: C17H19F6N3O4
Mol.Wt.: 443.35
Status: Custom Synthesis

N-Nitroso Terbinafine EP Impurity A

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CAT No: VS-N091161
CAS No: 296760-88-8
Mol.F.: C12H12N2O
Mol.Wt.: 200.2
Status: Custom Synthesis

Aceclofenac Nitroso Impurity 1

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CAT No: VS-N091162
CAS No: NA
Mol.F.: C16H12Cl2N2O5
Mol.Wt.: 383.2
Status: Custom Synthesis

N-Nitroso N-Desmethyl Ponatinib

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CAT No: VS-N091163
CAS No: NA
Mol.F.: C28H24F3N7O2
Mol.Wt.: 547.5
Status: Custom Synthesis

N-Nitroso Rivaroxaban Open-Ring Acid Impurity

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CAT No: VS-N091164
CAS No: NA
Mol.F.: C19H19ClN4O7S
Mol.Wt.: 482.9
Status: Custom Synthesis

N-Nitroso-rivaroxaban amide

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CAT No: VS-N091165
CAS No: NA
Mol.F.: C18H19ClN4O5S
Mol.Wt.: 438.89
Status: Custom Synthesis

Palbociclib Nitroso Impurity 4

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CAT No: VS-N091166
CAS No: NA
Mol.F.: C9H13N5O
Mol.Wt.: 207.2
Status: Custom Synthesis

N-Nitroso Triacetonamine

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CAT No: VS-N091167
CAS No: 640-01-7
Mol.F.: C9H16N2O2
Mol.Wt.: 184.24
Status: Custom Synthesis

N-Nitroso Doxazosin EP Impurity G

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CAT No: VS-N091168
CAS No: NA
Mol.F.: C14H18N6O3
Mol.Wt.: 318.34
Status: Custom Synthesis

N-Nitroso Doxazosin EP Impurity B

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CAT No: VS-N091169
CAS No: NA
Mol.F.: C13H15N3O4
Mol.Wt.: 277.3
Status: Custom Synthesis

N-Nitrosodihydrodibenzazepine

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CAT No: VS-N091170
CAS No: 7458-08-4
Mol.F.: C14H12N2O
Mol.Wt.: 224.3
Status: Custom Synthesis

N-Nitroso (S) Tamsulosin

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CAT No: VS-N091171
CAS No: NA
Mol.F.: C20H27N3O6S
Mol.Wt.: 437.51
Status: Custom Synthesis

N-Nitroso Diazepam EP Impurity D

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CAT No: VS-N091172
CAS No: 51145-18-7
Mol.F.: C14H11ClN2O2
Mol.Wt.: 274.7
Status: Custom Synthesis

N-Nitroso Trazodone Impurity

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CAT No: VS-N091173
CAS No: NA
Mol.F.: C23H29Cl2N5O
Mol.Wt.: 462.4
Status: Custom Synthesis

N-Nitroso Ropinirole EP Impurity D

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CAT No: VS-N091174
CAS No: NA
Mol.F.: C13H17N3O2
Mol.Wt.: 247.3
Status: Custom Synthesis

N-Nitroso Oxcarbazepine EP Impurity H

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CAT No: VS-N091175
CAS No: NA
Mol.F.: C15H12N2O2
Mol.Wt.: 252.3
Status: Custom Synthesis

N-Nitroso Oxcarbazepine EP Impurity D

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CAT No: VS-N091176
CAS No: NA
Mol.F.: C14H8N2O3
Mol.Wt.: 252.2
Status: Custom Synthesis

N-Nitroso Salbutamol EP Impurity J

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CAT No: VS-N091177
CAS No: NA
Mol.F.: C13H18N2O4
Mol.Wt.: 266.3
Status: Custom Synthesis

N-Nitroso O-Benzyl Indacaterol

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CAT No: VS-N091178
CAS No: NA
Mol.F.: C31H33N3O4
Mol.Wt.: 511.6
Status: Custom Synthesis

Crizotinib Nitroso Impurity

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CAT No: VS-N091179
CAS No: NA
Mol.F.: C21H21Cl2FN6O2
Mol.Wt.: 479.3
Status: Custom Synthesis

N-Nitroso Ethyl Isonipecotate

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CAT No: VS-N091180
CAS No: 13256-15-0
Mol.F.: C8H14N2O3
Mol.Wt.: 186.2
Status: Custom Synthesis

N-Nitroso Desmethyl Orphenadrine

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CAT No: VS-N091181
CAS No: NA
Mol.F.: C17H20N2O2
Mol.Wt.: 284.4
Status: Custom Synthesis

N-Nitroso (±)-Epinephrine

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CAT No: VS-N091182
CAS No: NA
Mol.F.: C9H12N2O4
Mol.Wt.: 212.2
Status: Custom Synthesis

N-Nitroso N-Desmethyl Tramadol

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CAT No: VS-N091183
CAS No: NA
Mol.F.: C15H22N2O3
Mol.Wt.: 278.4
Status: Custom Synthesis

N-Nitroso Perindopril EP Impurity A

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CAT No: VS-N091184
CAS No: 2912492-21-6
Mol.F.: C9H14N2O3
Mol.Wt.: 198.2
Status: Custom Synthesis

N-Nitroso Codeinone

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CAT No: VS-N091185
CAS No: NA
Mol.F.: C17H16N2O4
Mol.Wt.: 312.33
Status: Custom Synthesis

N-Nitroso Valsartan Methyl Ester

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CAT No: VS-N091186
CAS No: NA
Mol.F.: C20H22N6O3
Mol.Wt.: 394.4
Status: Custom Synthesis

N-Nitroso Lorcaserin

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CAT No: VS-N091187
CAS No: 2518136-84-8
Mol.F.: C11H13ClN2O
Mol.Wt.: 224.69
Status: Custom Synthesis

N-Nitroso Desipramine

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CAT No: VS-N091188
CAS No: 57164-17-7
Mol.F.: C18H21N3O
Mol.Wt.: 295.4
Status: Custom Synthesis

N-Nitroso Desmethyl Carbinoxamine

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CAT No: VS-N091189
CAS No: NA
Mol.F.: C15H16ClN3O2
Mol.Wt.: 305.8
Status: Custom Synthesis

N-Nitroso Desmethyl Cis-Doxepin

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CAT No: VS-N091190
CAS No: NA
Mol.F.: C18H18N2O2
Mol.Wt.: 294.4
Status: Custom Synthesis

N-Nitroso-N-Desmethyl Dapoxetine

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CAT No: VS-N091191
CAS No: NA
Mol.F.: C20H20N2O2
Mol.Wt.: 320.4
Status: Custom Synthesis

N-Nitroso Desmethyl S-Chlorpheniramine

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CAT No: VS-N091192
CAS No: NA
Mol.F.: C15H16ClN3O
Mol.Wt.: 289.8
Status: Custom Synthesis

N-Nitroso Norpheniramine

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CAT No: VS-N091193
CAS No: NA
Mol.F.: C15H17N3O
Mol.Wt.: 255.3
Status: Custom Synthesis

N-Nitroso N-Desmethyl Mepyramine

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CAT No: VS-N091194
CAS No: NA
Mol.F.: C16H20N4O2
Mol.Wt.: 300.4
Status: Custom Synthesis

N-Nitroso Sumatriptan

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CAT No: VS-N091195
CAS No: NA
Mol.F.: C14H20N4O3S
Mol.Wt.: 324.4
Status: Custom Synthesis

N-Nitroso Levalbuterol

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CAT No: VS-N091196
CAS No: NA
Mol.F.: C13H20N2O4
Mol.Wt.: 268.31
Status: Custom Synthesis

N-Nitroso Pethidine EP Impurity E

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CAT No: VS-N091197
CAS No: 13458-16-7
Mol.F.: C14H18N2O3
Mol.Wt.: 262.3
Status: Custom Synthesis

N-Nitroso Quinapril EP Impurity C

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CAT No: VS-N091198
CAS No: NA
Mol.F.: C23H25N3O6
Mol.Wt.: 439.5
Status: Custom Synthesis

N-Nitroso Oxymetazoline

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CAT No: VS-N091199
CAS No: NA
Mol.F.: C16H23N3O2
Mol.Wt.: 289.4
Status: Custom Synthesis

N-Nitroso N-Desmethyl Sildenafil

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CAT No: VS-N091200
CAS No: NA
Mol.F.: C21H27N7O5S
Mol.Wt.: 489.6
Status: Custom Synthesis

N-Nitroso N-desmethyl Pheniramine

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CAT No: VS-N091201
CAS No: NA
Mol.F.: C15H17N3O
Mol.Wt.: 255.31 
Status: Custom Synthesis

N-Nitroso Desmethyl Brompheniramine

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CAT No: VS-N091202
CAS No: NA
Mol.F.: C15H16BrN3O
Mol.Wt.: 334.2
Status: Custom Synthesis

N-Nitroso Diphenhydramine EP Impurity A

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CAT No: VS-N091203
CAS No: 55855-43-1
Mol.F.: C16H18N2O2
Mol.Wt.: 270.3
Status: Custom Synthesis

N-Nitroso Zolmitriptan

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CAT No: VS-N091204
CAS No: NA
Mol.F.: C16H20N4O3
Mol.Wt.: 316.4
Status: Custom Synthesis

Tolvaptan Nitroso Impurity 1

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CAT No: VS-N091205
CAS No: NA
Mol.F.: C10H11ClN2O2
Mol.Wt.: 226.7
Status: Custom Synthesis

N-Nitroso-Atomoxetine

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CAT No: VS-N091206
CAS No: NA
Mol.F.: C17H20N2O2
Mol.Wt.: 284.4
Status: Custom Synthesis

Brexpiprazole Nitroso Impurity 2

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CAT No: VS-N091207
CAS No: NA
Mol.F.: C17H22N4O3
Mol.Wt.: 330.4
Status: Custom Synthesis

Bilastine Nitroso Impurity 2

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CAT No: VS-N091208
CAS No: NA
Mol.F.: C16H22N4O2
Mol.Wt.: 302.4
Status: Custom Synthesis

Selexipag Nitroso Impurity 1

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CAT No: VS-N091209
CAS No: NA
Mol.F.: C7H16N2O2
Mol.Wt.: 160.2
Status: Custom Synthesis

Alogliptin Benzoate Dimer Nitroso Impurity

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CAT No: VS-N091210
CAS No: NA
Mol.F.: C31H29N9O5
Mol.Wt.: 607.6
Status: Custom Synthesis

N-Nitroso Betahistine EP Impurity C

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CAT No: VS-N091211
CAS No: NA
Mol.F.: C14H16N4O
Mol.Wt.: 256.3
Status: Custom Synthesis

N-Nitroso Des-ethyl Clomiphene

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CAT No: VS-N091212
CAS No: NA
Mol.F.: C24H23ClN2O2
Mol.Wt.: 406.9
Status: Custom Synthesis

N-Nitroso Ramipril EP Impurity F

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CAT No: VS-N091213
CAS No: NA
Mol.F.: C15H20N2O5
Mol.Wt.: 308.3
Status: Custom Synthesis

N-Nitroso Ramipril EP Impurity C

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CAT No: VS-N091214
CAS No: NA
Mol.F.: C23H37N3O6
Mol.Wt.: 451.56
Status: Custom Synthesis

N-Nitroso-(S)-Citalopram EP Impurity D

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CAT No: VS-N091215
CAS No: NA
Mol.F.: C19H18FN3O2
Mol.Wt.: 339.4
Status: Custom Synthesis

N-Nitroso Linagliptin Impurity

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CAT No: VS-N091216
CAS No: 3031851-92-7
Mol.F.: C10H19N3O3
Mol.Wt.: 229.3
Status: Custom Synthesis

N-Nitroso Trazodone Impurity 1

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CAT No: VS-N091217
CAS No: 2219339-13-4
Mol.F.: C10H12ClN3O
Mol.Wt.: 225.7
Status: Custom Synthesis

N-nitroso Terbutaline

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CAT No: VS-N091218
CAS No: NA
Mol.F.: C12H18N2O4
Mol.Wt.: 254.3
Status: Custom Synthesis

N-Nitroso Cyproheptadine

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CAT No: VS-N091219
CAS No: NA
Mol.F.: C20H18N2O
Mol.Wt.: 302.38
Status: Custom Synthesis

N-Nitroso N-Desmethyl Olanzapine

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CAT No: VS-N091220
CAS No: NA
Mol.F.: C16H17N5OS
Mol.Wt.: 327.4
Status: Custom Synthesis

N-Nitroso Paroxetine EP Impurity A

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CAT No: VS-N091221
CAS No: NA
Mol.F.: C19H20N2O4
Mol.Wt.: 340.4
Status: Custom Synthesis

N-Nitroso Linezolid Descarbonyl (R)-Isomer

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CAT No: VS-N091222
CAS No: NA
Mol.F.: C15H21FN4O4
Mol.Wt.: 340.4
Status: Custom Synthesis

N-nitroso desmethyl levomepromazine

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CAT No: VS-N091223
CAS No: NA
Mol.F.: C17H19N3O2S
Mol.Wt.: 329.42
Status: Custom Synthesis

Esmolol Acid Nitroso Impurity

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CAT No: VS-N091224
CAS No: NA
Mol.F.: C15H22N2O5
Mol.Wt.: 310.4
Status: Custom Synthesis

Esmolol Isopropyl Amine Nitroso Impurity

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CAT No: VS-N091225
CAS No: NA
Mol.F.: C18H29N3O4
Mol.Wt.: 351.4
Status: Custom Synthesis

N-Nitroso Atenolol EP Impurity G

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CAT No: VS-N091226
CAS No: NA
Mol.F.: C14H20N2O5
Mol.Wt.: 296.3
Status: Custom Synthesis

N-Nitroso Paroxetine EP Impurity I

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CAT No: VS-N091227
CAS No: NA
Mol.F.: C12H15FN2O2
Mol.Wt.: 238.3
Status: Custom Synthesis

N-Nitroso Imatinib EP Impurity C (Possibility 2)

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CAT No: VS-N091228
CAS No: 2816369-80-7
Mol.F.: C28H28N8O2
Mol.Wt.: 508.6
Status: Custom Synthesis

N-Nitroso Metamizole EP Impurity C

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CAT No: VS-N091229
CAS No: 73829-38-6
Mol.F.: C12H14N4O2
Mol.Wt.: 246.3
Status: Custom Synthesis

Esmolol Nitroso Impurity 1

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CAT No: VS-N091230
CAS No: NA
Mol.F.: C31H45N3O8
Mol.Wt.: 587.7
Status: Custom Synthesis

N-Nitroso Imatinib

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CAT No: VS-N091231
CAS No: NA
Mol.F.: C29H30N8O2
Mol.Wt.: 522.6
Status: Custom Synthesis

N-Nitroso Imatinib EP Impurity J

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CAT No: VS-N091232
CAS No: NA
Mol.F.: C29H30N8O3
Mol.Wt.: 538.61
Status: Custom Synthesis

N-Nitroso Imatinib EP Impurity F

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CAT No: VS-N091233
CAS No: NA
Mol.F.: C16H14N6O
Mol.Wt.: 306.3
Status: Custom Synthesis

N-Nitroso Olanzapine EP Impurity D

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CAT No: VS-N091234
CAS No: NA
Mol.F.: C17H19N5O2S
Mol.Wt.: 357.4
Status: Custom Synthesis

N-Nitroso Olanzapine EP Impurity B

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CAT No: VS-N091235
CAS No: NA
Mol.F.: C12H9N3O2S
Mol.Wt.: 259.3
Status: Custom Synthesis

N-Nitroso Linezolid open ring Impurity (R Isomer)

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CAT No: VS-N091236
CAS No: NA
Mol.F.: C16H19FN4O6
Mol.Wt.: 382.35
Status: Custom Synthesis

N-Nitroso Cariprazine

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CAT No: VS-N091237
CAS No: NA
Mol.F.: C21H31Cl2N5O2
Mol.Wt.: 456.4
Status: Custom Synthesis

N-Nitroso Azithromycin EP Impurity I

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CAT No: VS-N091238
CAS No: NA
Mol.F.: C37H69N3O13
Mol.Wt.: 764.0
Status: Custom Synthesis

N-Nitroso Cinnarizine EP Impurity A

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CAT No: VS-N091239
CAS No: 1698-25-5
Mol.F.: C17H19N3O
Mol.Wt.: 281.4
Status: Custom Synthesis

Abemaciclib Nitroso Metabolites M2

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CAT No: VS-N091240
CAS No: NA
Mol.F.: C25H27F2N9O
Mol.Wt.: 507.5
Status: Custom Synthesis

Ketoconazole Nitroso EP Impurity D

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CAT No: VS-N091241
CAS No: NA
Mol.F.: C24H25Cl2N5O4
Mol.Wt.: 518.4
Status: Custom Synthesis

N-Nitroso N-Desmethyl Clindamycin

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CAT No: VS-N091242
CAS No: NA
Mol.F.: C17H30ClN3O6S
Mol.Wt.: 439.95
Status: Custom Synthesis

Clopidogrel Nitroso Impurity

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CAT No: VS-N091243
CAS No: 2460755-43-3
Mol.F.: C7H8N2OS
Mol.Wt.: 168.2
Status: Custom Synthesis

N-Nitroso Valganciclovir EP Impurity N

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CAT No: VS-N091244
CAS No: NA
Mol.F.: C15H23N7O6
Mol.Wt.: 397.4
Status: Custom Synthesis

Diclofenac Desacetate Nitroso Impurity

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CAT No: VS-N091245
CAS No: NA
Mol.F.: C12H8Cl2N2O
Mol.Wt.: 267.1
Status: Custom Synthesis

N-Nitroso Piperaquine Impurity A

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CAT No: VS-N091246
CAS No: 32863-63-1
Mol.F.: C13H13ClN4O
Mol.Wt.: 276.7
Status: Custom Synthesis
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