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API Labeled Standards
Venkatasai is a leading provider of pharmaceutical reference standards, specializing in the supply of high-purity API Labeled Standards reference materials. Our portfolio includes both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope-labeled compounds, and nitrosamine derivatives (N-NO products). These reference standards play a crucial role in pharmaceutical R&D, aiding in formulation development, ANDA/DMF submissions, quality control, method validation, stability studies, and impurity profiling—including the identification and assessment of potentially genotoxic impurities.
Each API Labeled Standards-related product is rigorously characterized and delivered with a detailed Certificate of Analysis (COA) and comprehensive analytical data to ensure regulatory compliance. Upon request, we also offer EP/USP traceable standards. To maintain the highest quality standards, all materials are subject to periodic re-testing and continuous quality monitoring.
Rac Ketoprofen-D3
CAT No: VS-A186070
CAS No: 159490-55-8
Mol.F.: C16H11D3O3
Mol.Wt.: 257.3
Status: In Stock
Olanzapine D3
CAT No: VS-A186094
CAS No: 786686-79-1
Mol.F.: C17H17D3N4S
Mol.Wt.: 315.5
Status: In Stock
Omeprazole D3
CAT No: VS-A186095
CAS No: 934293-92-2
Mol.F.: C17H16D3N3O3S
Mol.Wt.: 348.4
Status: In Stock
Ondansetron D3
CAT No: VS-A186096
CAS No: 1132757-82-4
Mol.F.: C18H16D3N3O
Mol.Wt.: 296.4
Status: In Stock
Oseltamivir D5 Hydrochloride
CAT No: VS-A186098
CAS No: 2140263-19-8
Mol.F.: C16H23D5N2O4 : HCl
Mol.Wt.: 317.4 : 36.5
Status: In Stock
Osimertinib D6
CAT No: VS-A186099
CAS No: 1638281-44-3
Mol.F.: C28H27D6N7O2
Mol.Wt.: 505.7
Status: In Stock
Palbociclib-d8
CAT No: VS-A186101
CAS No: 1628752-83-9
Mol.F.: C24H21D8N7O2
Mol.Wt.: 455.6
Status: In Stock
rac trans-Paroxetine-d4 Hydrochloride
CAT No: VS-A186102
CAS No: 1217753-24-6
Mol.F.: C19H17D4ClFNO3 : HCl
Mol.Wt.: 369.9 : 36.5
Status: In Stock
Pazopanib-d3
CAT No: VS-A186103
CAS No: 1219591-97-5
Mol.F.: C21H20D3N7O2S
Mol.Wt.: 440.5
Status: In Stock
perospirone D8
CAT No: VS-A186104
CAS No: NA
Mol.F.: C23H23D8ClN4O2S
Mol.Wt.: 471.09
Status: In Stock
Phenytoin-d10
CAT No: VS-A186105
CAS No: 65854-97-9
Mol.F.: C15H2D10N2O2
Mol.Wt.: 262.3
Status: In Stock
Pitolisant-D10
CAT No: VS-A186106
CAS No: 2416991-74-5
Mol.F.: C17H16D10ClNO
Mol.Wt.: 305.91
Status: In Stock
Pirfenidone-D3
CAT No: VS-A186107
CAS No: 1093951-85-9
Mol.F.: C12H8D3NO
Mol.Wt.: 188.24
Status: In Stock
Prazosin D8
CAT No: VS-A186109
CAS No: 1006717-55-0
Mol.F.: C19H13D8N5O4
Mol.Wt.: 391.5
Status: In Stock
Propiomazine-D6
CAT No: VS-A186111
CAS No: 2714474-32-3
Mol.F.: C20H18D6N2OS
Mol.Wt.: 382.98
Status: In Stock
Promethazine D6
CAT No: VS-A186112
CAS No: 1190043-26-5
Mol.F.: C17H14D6N2S
Mol.Wt.: 290.5
Status: In Stock
Propafenone-d5 Hydrochloride
CAT No: VS-A186113
CAS No: 1346605-05-7
Mol.F.: C21H23D5ClNO3
Mol.Wt.: 382.94
Status: In Stock
Propranolol -D7 hydrochloride
CAT No: VS-A186114
CAS No: NA
Mol.F.: C16H15D7ClNO2
Mol.Wt.: 302.85
Status: In Stock
Raloxifene-d4
CAT No: VS-A186115
CAS No: 1185076-44-1
Mol.F.: C28H23D4NO4S
Mol.Wt.: 477.61
Status: In Stock
Ranolazine-d3
CAT No: VS-A186116
CAS No: 1054624-77-9
Mol.F.: C24H30D3N3O4
Mol.Wt.: 430.56
Status: In Stock
Ranolazine-D8
CAT No: VS-A186117
CAS No: 1092804-88-0
Mol.F.: C24H25D8N3O4
Mol.Wt.: 435.59
Status: In Stock
Resiquimod-d5
CAT No: VS-A186118
CAS No: 2252319-44-9
Mol.F.: C17H17D5N4O2
Mol.Wt.: 319.41
Status: In Stock
Ritonavir-d6
CAT No: VS-A186119
CAS No: 1217720-20-1
Mol.F.: C37H42D6N6O5S2
Mol.Wt.: 726.98
Status: In Stock
Ribociclib-D8
CAT No: VS-A186120
CAS No: 2167898-24-8
Mol.F.: C23H22D8N8O
Mol.Wt.: 442.6
Status: In Stock
Rivastigmine-D6
CAT No: VS-A186121
CAS No: 194929-99-2
Mol.F.: C14H16D6N2O2
Mol.Wt.: 256.4
Status: In Stock
Ruxolitinib D9
CAT No: VS-A186123
CAS No: 1513883-55-0
Mol.F.: C17H9D9N6
Mol.Wt.: 315.4
Status: In Stock
Sacubitril D4
CAT No: VS-A186124
CAS No: 1884269-07-1
Mol.F.: C24H25D4NO5
Mol.Wt.: 415.5
Status: In Stock
Salmeterol D3
CAT No: VS-A186125
CAS No: 497063-94-2
Mol.F.: C25H34D3NO4
Mol.Wt.: 418.6
Status: In Stock
Quetiapine D4
CAT No: VS-A186162
CAS No: 1217311-36-8
Mol.F.: C21H21D4N3O2S
Mol.Wt.: 387.53
Status: In Stock
Rilpivirine d6
CAT No: VS-A186165
CAS No: 1312424-26-2
Mol.F.: C22H12D6N6
Mol.Wt.: 372.46
Status: In Stock
Risperidone D6
CAT No: VS-A186166
CAS No: 1225444-65-4
Mol.F.: C23H21D6FN4O2
Mol.Wt.: 416.5
Status: In Stock
Pantoprazole D6
CAT No: VS-A186174
CAS No: 922727-65-9
Mol.F.: C16H9D6F2N3O4S
Mol.Wt.: 389.4
Status: In Stock
Rosuvastatin D6
CAT No: VS-A186179
CAS No: 2070009-40-2
Mol.F.: C22H22D6FN3O6S
Mol.Wt.: 487.6
Status: In Stock
S-Adenosyl-L-methionine D3
CAT No: VS-A186186
CAS No: 68684-40-2
Mol.F.: C15H19D3N6O5S
Mol.Wt.: 401.46
Status: Custom Synthesis
Rebamipide-d4
CAT No: VS-A186190
CAS No: 1219409-06-9
Mol.F.: C19H11D4ClN2O4
Mol.Wt.: 374.81
Status: In Stock
Rivaroxaban-D4
CAT No: VS-A186199
CAS No: 1132681-38-9
Mol.F.: C19H14D4ClN3O5S
Mol.Wt.: 439.9
Status: Custom Synthesis
Racemic Mirabegron D5
CAT No: VS-A186201
CAS No: 1215807-38-7
Mol.F.: C21H19D5N4O2S
Mol.Wt.: 401.5
Status: Custom Synthesis
Rapamycin D3
CAT No: VS-A186208
CAS No: 392711-19-2
Mol.F.: C51H76D3NO13
Mol.Wt.: 917.2
Status: Custom Synthesis
Pomalidomide D4
CAT No: VS-A186232
CAS No: 1416575-78-4
Mol.F.: C13H7D4N3O4
Mol.Wt.: 277.3
Status: Custom Synthesis
rac-Threo-Dihydro Bupropion D9 HCl
CAT No: VS-A186233
CAS No: 1392209-60-7
Mol.F.: C13H11D9ClNO : HCl
Mol.Wt.: 250.8 : 36.5
Status: Custom Synthesis
rac-Erythro-Dihydro Bupropion D9 HCl
CAT No: VS-A186240
CAS No: 2517771-79-6
Mol.F.: C13H11D9ClNO : HCl
Mol.Wt.: 250.8 : 36.5
Status: Custom Synthesis
Omeprazole-D3 Sulfone N-Oxide
CAT No: VS-A186254
CAS No: 2748468-58-6
Mol.F.: C17H16D3N3O5S
Mol.Wt.: 380.43
Status: Custom Synthesis
rac-trans-Ambroxol-D5
CAT No: VS-A186259
CAS No: 1246818-80-3
Mol.F.: C13H13D5Br2N2O
Mol.Wt.: 383.13
Status: Custom Synthesis
rac-trans-Ambroxol-D5 Hydrochloride
CAT No: VS-A186260
CAS No: NA
Mol.F.: C13H13D5Br2N2O : HCl
Mol.Wt.: 383.13 : 36.5
Status: Custom Synthesis
rac Cinacalcet-d3 Hydrochloride
CAT No: VS-A186266
CAS No: 1185097-33-9
Mol.F.: C22H20D3ClF3N
Mol.Wt.: 396.89
Status: Custom Synthesis
R-(+)-Warfarin-d5
CAT No: VS-A186268
CAS No: 773005-79-1
Mol.F.: C19H11D5O4
Mol.Wt.: 313.36
Status: Custom Synthesis
S-(-)-Warfarin-d5
CAT No: VS-A186269
CAS No: 791013-22-4
Mol.F.: C19H11D5O4
Mol.Wt.: 313.36
Status: Custom Synthesis
Rac-Omeprazole-D3
CAT No: VS-A186282
CAS No: 922731-01-9
Mol.F.: C17H16D3N3O3S
Mol.Wt.: 348.4
Status: Custom Synthesis
Omeprazole-d3 Sulfide
CAT No: VS-A186299
CAS No: 922730-98-1
Mol.F.: C17H16D3N3O2S
Mol.Wt.: 332.44
Status: Custom Synthesis
Omeprazole-d3 Sulfone
CAT No: VS-A186300
CAS No: 1189891-71-1
Mol.F.: C17H16D3N3O4S
Mol.Wt.: 364.43
Status: Custom Synthesis
Promethazine D6 Hydrochloride
CAT No: VS-A186301
CAS No: 1189947-02-1
Mol.F.: C17H14D6N2S : HCl
Mol.Wt.: 290.5 : 36.5
Status: Custom Synthesis
Olmesartan-D4 Acid
CAT No: VS-A186317
CAS No: 1420880-41-6
Mol.F.: C24H22D4N6O3
Mol.Wt.: 450.5
Status: Custom Synthesis
Ranolazine-D8 Dihydrochloride
CAT No: VS-A186319
CAS No: 1219802-60-4
Mol.F.: C24H25D8N3O4 : 2(HCl)
Mol.Wt.: 435.6 : 2(36.5)
Status: Custom Synthesis
Prasugrel-D4 Metabolite
CAT No: VS-A186337
CAS No: 2673269-91-3
Mol.F.: C18H14D4FNO2S
Mol.Wt.: 335.4
Status: Custom Synthesis
Praziquantel D11
CAT No: VS-A186346
CAS No: 1246343-36-1
Mol.F.: C19H13D11N2O2
Mol.Wt.: 323.5
Status: Custom Synthesis
rac-Duloxetine-D3 Oxalate
CAT No: VS-A186348
CAS No: 11617-14-2
Mol.F.: C20H18D3NO5S
Mol.Wt.: 390.47
Status: Custom Synthesis
Ranolazine-D8 Intermediate
CAT No: VS-A186350
CAS No: NA
Mol.F.: C14H13D8N3O
Mol.Wt.: 255.39
Status: Custom Synthesis
Ranolazine-D8 Impurity
CAT No: VS-A186351
CAS No: NA
Mol.F.: C24H24D8N4O2
Mol.Wt.: 416.59
Status: Custom Synthesis
Ranitidine-d6 Hydrochloride
CAT No: VS-A186360
CAS No: 1185238-09-8
Mol.F.: C13H17D6ClN4O3S
Mol.Wt.: 356.9
Status: Custom Synthesis
S-(-)-Carbidopa-D3 (ring)
CAT No: VS-A186361
CAS No: NA
Mol.F.: C10H11D3N2O4
Mol.Wt.: 229.25
Status: Custom Synthesis
rac-Clopidogrel-D3 Bisulfate
CAT No: VS-A186372
CAS No: NA
Mol.F.: C16H15D3ClNO6S2
Mol.Wt.: 422.92
Status: Custom Synthesis
Oxybutynin D11 Hydrochloride
CAT No: VS-A186374
CAS No: 1185151-95-4
Mol.F.: C22H20D11NO3 : HCl
Mol.Wt.: 368.6 : 36.5
Status: Custom Synthesis
Ranitidine D6
CAT No: VS-A186375
CAS No: 1185514-83-3
Mol.F.: C13H16D6N4O3S
Mol.Wt.: 320.4
Status: Custom Synthesis
Phenyl-D5-Boronic Acid
CAT No: VS-A186400
CAS No: 215527-70-1
Mol.F.: C6H2D5BO2
Mol.Wt.: 126.96
Status: Custom Synthesis
Pyridostigmine-d6 bromide
CAT No: VS-A186451
CAS No: 2375858-08-3
Mol.F.: C9H7D6N2O2 : Br
Mol.Wt.: 187.3 : 79.9
Status: Custom Synthesis
rac-Propanolol D7
CAT No: VS-A186464
CAS No: 344298-99-3
Mol.F.: C16H14D7NO2
Mol.Wt.: 266.4
Status: Custom Synthesis
Perazine-d8 Dihydrochloride Salt
CAT No: VS-A186470
CAS No: 1246815-57-5
Mol.F.: C20H19D8Cl2N3S
Mol.Wt.: 420.47
Status: Custom Synthesis
Propranolol D7
CAT No: VS-A186473
CAS No: 98897-23-5
Mol.F.: C16H14D7NO2
Mol.Wt.: 266.3
Status: Custom Synthesis
Rac 1-Palmitoyl-3-chloropropanediol-d5
CAT No: VS-A186489
CAS No: 1346599-60-7
Mol.F.: C19H32D5ClO3
Mol.Wt.: 353.98
Status: Custom Synthesis
Propoxur D3
CAT No: VS-A186529
CAS No: 1219798-56-7
Mol.F.: C11H12D3NO3
Mol.Wt.: 212.26
Status: Custom Synthesis
Pirimicarb D6
CAT No: VS-A186537
CAS No: 1015854-66-6
Mol.F.: C11H12D6N4O2
Mol.Wt.: 244.33
Status: Custom Synthesis
Pencycuron-d5
CAT No: VS-A186543
CAS No: 83286-58-2
Mol.F.: C19H16D5ClN2O
Mol.Wt.: 333.87
Status: Custom Synthesis
Paraquat dichloride D6
CAT No: VS-A186564
CAS No: NA
Mol.F.: C12H8D6Cl2N2
Mol.Wt.: 263.2
Status: Custom Synthesis
Pyrimethanil-d5
CAT No: VS-A186569
CAS No: 2118244-83-8
Mol.F.: C12H8D5N3
Mol.Wt.: 204.29
Status: Custom Synthesis
Phenmedipham D3
CAT No: VS-A186571
CAS No: 1773497-41-8
Mol.F.: C16H13D3N2O4
Mol.Wt.: 303.33
Status: Custom Synthesis
Propachlor-D5
CAT No: VS-A186572
CAS No: NA
Mol.F.: C11H9D5ClNO
Mol.Wt.: 216.72
Status: Custom Synthesis
Picoxystrobin-D3
CAT No: VS-A186581
CAS No: NA
Mol.F.: C18H13D3F3NO4
Mol.Wt.: 370.34
Status: Custom Synthesis
Parathion-D10
CAT No: VS-A186587
CAS No: 350820-04-1
Mol.F.: C10H4D10NO5PS
Mol.Wt.: 301.32
Status: Custom Synthesis
Saroglitazar D4 Magnesium Salt
CAT No: VS-A186611
CAS No: NA
Mol.F.: 2(C25H24D4NO4S).Mg
Mol.Wt.: 909.48
Status: Custom Synthesis
Phenylethanolamine A-D3
CAT No: VS-A186637
CAS No: 2507994-61-6
Mol.F.: C19H21D3N2O4
Mol.Wt.: 347.42
Status: Custom Synthesis
Ractopamine D3 hydrochloride
CAT No: VS-A186638
CAS No: 1219794-72-5
Mol.F.: C18H20D3NO3 : HCl
Mol.Wt.: 304.40 : 36.46
Status: Custom Synthesis
Ofloxacin-D8
CAT No: VS-A186655
CAS No: 1219170-21-4
Mol.F.: C18H12D8FN3O4
Mol.Wt.: 369.42
Status: Custom Synthesis
Pefloxacin-D3
CAT No: VS-A186656
CAS No: 2733455-58-6
Mol.F.: C17H17D3FN3O3
Mol.Wt.: 336.38
Status: Custom Synthesis
Sarafloxacin-D8
CAT No: VS-A186658
CAS No: 1352879-52-7
Mol.F.: C20H9D8F2N3O3
Mol.Wt.: 393.41
Status: Custom Synthesis
Sarafloxacin-D8 hydrochloride
CAT No: VS-A186659
CAS No: 2733145-07-6
Mol.F.: C20H10D8ClF2N3O3
Mol.Wt.: 429.87
Status: Custom Synthesis
Oxolinic Acid-D5
CAT No: VS-A186666
CAS No: 1189890-98-9
Mol.F.: C13H6D5NO5
Mol.Wt.: 266.26
Status: Custom Synthesis
Pefloxacin-D5
CAT No: VS-A186667
CAS No: 1228182-51-1
Mol.F.: C17H15D5FN3O3
Mol.Wt.: 338.39
Status: Custom Synthesis
Quinocetone-D5
CAT No: VS-A186669
CAS No: NA
Mol.F.: C18H9D5N2O3
Mol.Wt.: 311.35
Status: Custom Synthesis
Olaquindox-D4
CAT No: VS-A186671
CAS No: 1189487-82-8
Mol.F.: C12H9D4N3O4
Mol.Wt.: 267.27
Status: Custom Synthesis
Quinocetone-D5
CAT No: VS-A186679
CAS No: NA
Mol.F.: C18H9D5N2O3
Mol.Wt.: 311.35
Status: Custom Synthesis
Ronidazole-D3
CAT No: VS-A186682
CAS No: 1015855-87-4
Mol.F.: C6H5D3N4O4
Mol.Wt.: 203.17
Status: Custom Synthesis
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