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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.
Abiraterone acetate-D3
CAT No: VS-A186000
CAS No: 2122245-10-5
Mol.F.: C26H30D3NO2
Mol.Wt.: 394.57
Status: In Stock
Acenocoumarol-D5
CAT No: VS-A186001
CAS No: 1185071-64-0
Mol.F.: C19H10D5NO6
Mol.Wt.: 358.36
Status: In Stock
Afatinib D6
CAT No: VS-A186003
CAS No: 1313874-96-2
Mol.F.: C24H19D6ClFN5O3
Mol.Wt.: 492.0
Status: In Stock
Agomelatine-d3
CAT No: VS-A186004
CAS No: 1079389-38-0
Mol.F.: C15H14D3NO2
Mol.Wt.: 246.3
Status: In Stock
Agomelatine D6
CAT No: VS-A186005
CAS No: 1079389-42-6
Mol.F.: C15H11D6NO2
Mol.Wt.: 249.3
Status: In Stock
Albendazole D3
CAT No: VS-A186006
CAS No: 1353867-92-1
Mol.F.: C12H12D3N3O2S
Mol.Wt.: 268.4
Status: In Stock
Alcaftadine-d3
CAT No: VS-A186007
CAS No: 1794775-80-6
Mol.F.: C19H18D3N3O
Mol.Wt.: 310.41
Status: In Stock
Alfuzosin D6
CAT No: VS-A186008
CAS No: 1006717-31-2
Mol.F.: C19H21D6N5O4
Mol.Wt.: 395.49
Status: In Stock
Alvimopan-d5
CAT No: VS-A186009
CAS No: 1217616-62-0
Mol.F.: C25H27D5N2O4
Mol.Wt.: 429.56
Status: In Stock
Ambrisentan D3
CAT No: VS-A186010
CAS No: 1046116-26-0
Mol.F.: C22H19D3N2O4
Mol.Wt.: 381.5
Status: In Stock
Atazanavir-D6
CAT No: VS-A186012
CAS No: 1092540-50-5
Mol.F.: C38H46D6N6O7
Mol.Wt.: 710.89
Status: In Stock
Avobenzone D3
CAT No: VS-A186013
CAS No: 2518100-58-6
Mol.F.: C20H19D3O3
Mol.Wt.: 313.41
Status: In Stock
Axitinib-d3
CAT No: VS-A186014
CAS No: 1126623-89-9
Mol.F.: C22H15D3N4OS
Mol.Wt.: 389.49
Status: In Stock
Baclofen-d4
CAT No: VS-A186015
CAS No: 1189938-30-4
Mol.F.: C10H8D4ClNO2
Mol.Wt.: 217.69
Status: In Stock
Binimetinib-D3
CAT No: VS-A186016
CAS No: NA
Mol.F.: C17H12D3BrF2N4O3
Mol.Wt.: 444.25
Status: In Stock
Biopterin-d3
CAT No: VS-A186017
CAS No: 1217838-71-5
Mol.F.: C9H8D3N5O3
Mol.Wt.: 240.23
Status: In Stock
Bosentan-D4
CAT No: VS-A186018
CAS No: 1065472-77-6
Mol.F.: C27H25D4N5O6S
Mol.Wt.: 555.64
Status: In Stock
Brexpiprazole-d8
CAT No: VS-A186019
CAS No: 1427049-19-1
Mol.F.: C25H19D8N3O2S
Mol.Wt.: 441.62
Status: In Stock
Bupropion-d9
CAT No: VS-A186022
CAS No: 150988-80-0
Mol.F.: C13H9D9ClNO
Mol.Wt.: 248.8
Status: In Stock
Buspirone-D8
CAT No: VS-A186023
CAS No: 204395-49-3
Mol.F.: C21H23D8N5O2
Mol.Wt.: 393.56
Status: In Stock
Candesartan-d5
CAT No: VS-A186024
CAS No: 1189650-58-5
Mol.F.: C24H15D5N6O3
Mol.Wt.: 445.48
Status: In Stock
Carvedilol-d4
CAT No: VS-A186027
CAS No: 1133705-56-2
Mol.F.: C24H26N2O4
Mol.Wt.: 410.5
Status: In Stock
Cilostazol-D11
CAT No: VS-A186029
CAS No: 1073608-02-2
Mol.F.: C20H16D11N5O2
Mol.Wt.: 380.52
Status: In Stock
Citalopram Hydrobromide-D3
CAT No: VS-A186030
CAS No: NA
Mol.F.: C20H19D3BrFN2O
Mol.Wt.: 408.33
Status: In Stock
7-Amino Clonazepam D4
CAT No: VS-A186159
CAS No: 1215070-96-4
Mol.F.: C15H8D4ClN3O
Mol.Wt.: 289.8
Status: In Stock
4-Hydroxy-3-(methoxy-d3)benzaldehyde
CAT No: VS-A186160
CAS No: 74495-74-2
Mol.F.: C8H5D3O3
Mol.Wt.: 155.17
Status: In Stock
3,4-Dihydroxybenzaldehyde-d3
CAT No: VS-A186161
CAS No: 180028-20-0
Mol.F.: C7H3D3O3
Mol.Wt.: 141.14
Status: In Stock
Cabotegravir D3
CAT No: VS-A186164
CAS No: NA
Mol.F.: C19H14D3F2N3O5
Mol.Wt.: 408.4
Status: In Stock
Atorvastatin-d5
CAT No: VS-A186175
CAS No: 749193-45-1
Mol.F.: C33H30D5FN2O5
Mol.Wt.: 563.7
Status: In Stock
Acetylsalicylic Acid-D4
CAT No: VS-A186178
CAS No: 97781-16-3
Mol.F.: C9H4O4D4
Mol.Wt.: 184.2
Status: In Stock
(S)-Lercanidipine D3 Hydrochloride
CAT No: VS-A186184
CAS No: 1217740-02-7
Mol.F.: C36H38D3N3O6 : HCl
Mol.Wt.: 614.8 : 36.5
Status: Custom Synthesis
(R)-Lercanidipine-D3 Hydrochloride
CAT No: VS-A186185
CAS No: 1217724-52-1
Mol.F.: C36H38D3N3O6 : HCl
Mol.Wt.: 614.7 : 36.5
Status: Custom Synthesis
Beta-Methylcholine Chloride D3
CAT No: VS-A186188
CAS No: NA
Mol.F.: C6H13D3ClNO
Mol.Wt.: 156.67
Status: Custom Synthesis
Bisoprolol D5
CAT No: VS-A186189
CAS No: 1189881-87-5
Mol.F.: C18H26D5NO4
Mol.Wt.: 330.5
Status: Custom Synthesis
Cetirizine D4
CAT No: VS-A186191
CAS No: 1219803-84-5
Mol.F.: C21H21D4ClN2O3
Mol.Wt.: 392.9
Status: Custom Synthesis
Azithromycin-d3
CAT No: VS-A186197
CAS No: 163921-65-1
Mol.F.: C38H69D3N2O12
Mol.Wt.: 752
Status: Custom Synthesis
Bilastine D6
CAT No: VS-A186200
CAS No: 1215358-58-9
Mol.F.: C28H31D6N3O3
Mol.Wt.: 469.65
Status: Custom Synthesis
Bromhexine D3 Hydrochloride
CAT No: VS-A186202
CAS No: NA
Mol.F.: C14H17D3Br2N2 : HCl
Mol.Wt.: 379.15 : 36.5
Status: Custom Synthesis
1,4-Dinitrosopiperazine-D8
CAT No: VS-A186204
CAS No: 69340-07-4
Mol.F.: C4D8N4O2
Mol.Wt.: 152.2
Status: Custom Synthesis
4-Trans-Hydroxy Cilostazol-D5
CAT No: VS-A186210
CAS No: NA
Mol.F.: C20H22D5N5O3
Mol.Wt.: 390.5
Status: Custom Synthesis
24-Nor Taurolithocholic Acid-D4 Sodium
CAT No: VS-A186211
CAS No: NA
Mol.F.: C25H38D4NNaO5S
Mol.Wt.: 495.68
Status: Custom Synthesis
24-Nor Tauroursodeoxycholic Acid-D4 (major)
CAT No: VS-A186212
CAS No: NA
Mol.F.: C25H38D4NNaO6S
Mol.Wt.: 511.68
Status: Custom Synthesis
Bictegravir-D4
CAT No: VS-A186217
CAS No: 2714436-47-0
Mol.F.: C21H14D4F3N3O5
Mol.Wt.: 453.41
Status: Custom Synthesis
Bictegravir-D4 Sodium
CAT No: VS-A186218
CAS No: NA
Mol.F.: C21H13D4F3N3NaO5
Mol.Wt.: 475.39
Status: Custom Synthesis
6-Hydroxy Benzbromarone-D5 (major)
CAT No: VS-A186221
CAS No: NA
Mol.F.: C17H7D5Br2O4
Mol.Wt.: 445.11
Status: Custom Synthesis
24-Nor Lithocholic Acid-D4
CAT No: VS-A186222
CAS No: NA
Mol.F.: C23H34D4O3
Mol.Wt.: 366.57
Status: Custom Synthesis
24-Nor Ursodeoxycholic Acid-D4
CAT No: VS-A186223
CAS No: NA
Mol.F.: C23H34D4O4
Mol.Wt.: 382.57
Status: Custom Synthesis
Cabotegravir-D3 Sodium
CAT No: VS-A186229
CAS No: NA
Mol.F.: C19H13D3F2N3NaO5
Mol.Wt.: 430.35
Status: Custom Synthesis
3-Hydroxy-3-methylhexanoic Acid-D5
CAT No: VS-A186231
CAS No: NA
Mol.F.: C7H9D5O3
Mol.Wt.: 151.22
Status: Custom Synthesis
24-Methylenecholesterol-D7
CAT No: VS-A186237
CAS No: 209112-82-3
Mol.F.: C28H39OD7
Mol.Wt.: 405.72
Status: Custom Synthesis
20α/β-Dihydrodydrogesterone-D7 (major) 1:1 mixture
CAT No: VS-A186238
CAS No: NA
Mol.F.: C21H23D7O2
Mol.Wt.: 321.51
Status: Custom Synthesis
17-Desacetyl Norgestimate-D8 (major)
CAT No: VS-A186252
CAS No: NA
Mol.F.: C21H21D8NO2
Mol.Wt.: 335.51
Status: Custom Synthesis
(R)-Cinacalcet-D3
CAT No: VS-A186255
CAS No: 1228567-12-1
Mol.F.: C22H19D3F3N
Mol.Wt.: 360.4
Status: Custom Synthesis
(R)-Cinacalcet-D3 Hydrochloride
CAT No: VS-A186256
CAS No: NA
Mol.F.: C22H19D3F3N : HCl
Mol.Wt.: 360.4 : 36.5
Status: Custom Synthesis
(S)-Cinacalcet-d3
CAT No: VS-A186257
CAS No: NA
Mol.F.: C22H19D3F3N
Mol.Wt.: 360.4
Status: Custom Synthesis
(S)-Cinacalcet-D3 Hydrochloride
CAT No: VS-A186258
CAS No: NA
Mol.F.: C22H19D3F3N : HCl
Mol.Wt.: 360.4 : 36.5
Status: Custom Synthesis
4-(N,N-Diethylaminocarbonyl)methyl-4,4'4,''-Trimethylcurcumin-D3
CAT No: VS-A186261
CAS No: 2673270-28-3
Mol.F.: C30H34D3NO7
Mol.Wt.: 526.64
Status: Custom Synthesis
Chlorthalidone D4
CAT No: VS-A186267
CAS No: 1794941-44-8
Mol.F.: C14H7D4ClN2O4S
Mol.Wt.: 342.8
Status: Custom Synthesis
Amoxicillin-D4
CAT No: VS-A186274
CAS No: 2673270-36-3
Mol.F.: C16H15N3O5SD4
Mol.Wt.: 369.4
Status: Custom Synthesis
Atovaquone-d4
CAT No: VS-A186275
CAS No: 2070015-14-2
Mol.F.: C22H15ClO3D4
Mol.Wt.: 370.9
Status: Custom Synthesis
17-Desacetyl Norgestimate-3-acetate-D6
CAT No: VS-A186276
CAS No: NA
Mol.F.: C23H25D6NO3
Mol.Wt.: 375.54
Status: Custom Synthesis
7α-Methylthio Spironolactone-D3
CAT No: VS-A186280
CAS No: NA
Mol.F.: C23H29D3O3S
Mol.Wt.: 391.56
Status: Custom Synthesis
4-Trifluoromethoxybenzoic Acid-D4
CAT No: VS-A186285
CAS No: NA
Mol.F.: C8HD4F3O3
Mol.Wt.: 210.14
Status: Custom Synthesis
21-Desacetyl Deflazacort-D5
CAT No: VS-A186287
CAS No: NA
Mol.F.: C23H24D5NO5
Mol.Wt.: 404.52
Status: Custom Synthesis
Budesonide D8
CAT No: VS-A186289
CAS No: 1105542-94-6
Mol.F.: C25H26D8O6
Mol.Wt.: 438.6
Status: Custom Synthesis
3-Deoxy Chlorthalidone-D4
CAT No: VS-A186290
CAS No: NA
Mol.F.: C14H7ClN2O3SD4
Mol.Wt.: 326.79
Status: Custom Synthesis
20β-Dihydrodydrogesterone-D7
CAT No: VS-A186291
CAS No: NA
Mol.F.: C21H23D7O2
Mol.Wt.: 321.51
Status: Custom Synthesis
5α/6α-Hydroxy Lurasidone-D8
CAT No: VS-A186295
CAS No: NA
Mol.F.: C28H28D8N4O3S
Mol.Wt.: 516.73
Status: Custom Synthesis
6α-Methylprednisolone-17-Propionate-D6
CAT No: VS-A186297
CAS No: NA
Mol.F.: C25H28D6O6
Mol.Wt.: 436.58
Status: Custom Synthesis
Betamethasone-17-propionate-D4
CAT No: VS-A186302
CAS No: NA
Mol.F.: C25H29D4FO6
Mol.Wt.: 452.52
Status: Custom Synthesis
1β-Hydroxyglycodeoxycholic Acid-D4
CAT No: VS-A186305
CAS No: NA
Mol.F.: C26H39D4NO6
Mol.Wt.: 469.66
Status: Custom Synthesis
1ß-Hydroxytaurodeoxycholic Acid-D4 Sodium
CAT No: VS-A186306
CAS No: NA
Mol.F.: C26H40D4NNaO7S
Mol.Wt.: 541.65
Status: Custom Synthesis
Bempedoic Acid-D5
CAT No: VS-A186309
CAS No: 2408131-71-3
Mol.F.: C19H31D5O5
Mol.Wt.: 349.5
Status: Custom Synthesis
Budesonide Impurity 1-d8
CAT No: VS-A186310
CAS No: NA
Mol.F.: C25H24D8O7
Mol.Wt.: 452.57
Status: Custom Synthesis
6α-Methylprednisolone-21-Acetate-D6
CAT No: VS-A186313
CAS No: NA
Mol.F.: C24H26D6O6
Mol.Wt.: 422.55
Status: Custom Synthesis
Canrenone-D7
CAT No: VS-A186314
CAS No: NA
Mol.F.: C22H21D7O3
Mol.Wt.: 347.51
Status: Custom Synthesis
6α-Methylprednisolone-D6
CAT No: VS-A186315
CAS No: NA
Mol.F.: C22H24D6O5
Mol.Wt.: 380.51
Status: Custom Synthesis
17-Desacetyl Norgestimate D6
CAT No: VS-A186320
CAS No: 1263184-13-9
Mol.F.: C21H23D6NO2
Mol.Wt.: 333.5
Status: Custom Synthesis
Amlodipine-D4
CAT No: VS-A186322
CAS No: 1185246-14-3
Mol.F.: C20H21D4ClN2O5
Mol.Wt.: 412.9
Status: Custom Synthesis
Betamethasone D4
CAT No: VS-A186323
CAS No: NA
Mol.F.: C22H25D4FO5
Mol.Wt.: 396.5
Status: Custom Synthesis
Chenodeoxycholic Acid-D4
CAT No: VS-A186324
CAS No: 99102-69-9
Mol.F.: C24H36D4O4
Mol.Wt.: 396.6
Status: Custom Synthesis
3β-Chenodeoxycholic Acid-D4
CAT No: VS-A186325
CAS No: NA
Mol.F.: C24H36D4O4
Mol.Wt.: 396.6
Status: Custom Synthesis
3β-Deoxycholic Acid-D4
CAT No: VS-A186328
CAS No: NA
Mol.F.: C24H36D4O4
Mol.Wt.: 396.6
Status: Custom Synthesis
1β-Hydroxydeoxycholic Acid-D4
CAT No: VS-A186331
CAS No: 2089602-33-3
Mol.F.: C24H36D4O5
Mol.Wt.: 412.53
Status: Custom Synthesis
3-Hydroxy-3-Methylpentanoic Acid-D5
CAT No: VS-A186332
CAS No: NA
Mol.F.: C6H7D5O3
Mol.Wt.: 137.19
Status: Custom Synthesis
3β-Lithocholic Acid-D4
CAT No: VS-A186335
CAS No: NA
Mol.F.: C24H36D4O3
Mol.Wt.: 380.6
Status: Custom Synthesis
3β-Ursodeoxycholic Acid-D4
CAT No: VS-A186340
CAS No: NA
Mol.F.: C24H36D4O4
Mol.Wt.: 396.6
Status: Custom Synthesis
Amlodipine-D4 Maleate
CAT No: VS-A186366
CAS No: 1185246-15-4
Mol.F.: C24H25D4ClN2O9
Mol.Wt.: 528.97
Status: Custom Synthesis
Chlorzoxazone-4,6,7 D3
CAT No: VS-A186367
CAS No: 1185173-60-7
Mol.F.: C7HD3ClNO2
Mol.Wt.: 172.6
Status: Custom Synthesis
4′,4″-O,O-Dimethylcurcumin-D6
CAT No: VS-A186373
CAS No: NA
Mol.F.: C23H18D6O6
Mol.Wt.: 402.48
Status: Custom Synthesis
17β-Estradiol-17-valerate-D4
CAT No: VS-A186376
CAS No: NA
Mol.F.: C23H28D4O3
Mol.Wt.: 360.53
Status: Custom Synthesis
Bupropion D9 Hydrochloride
CAT No: VS-A186379
CAS No: 1189725-26-5
Mol.F.: C13H9D9ClNO : HCl
Mol.Wt.: 248.8 : 36.5
Status: Custom Synthesis
Ciprofloxacin D8 Hydrochloride
CAT No: VS-A186388
CAS No: 1216659-54-9
Mol.F.: C17H10D8FN3O3 : HCl
Mol.Wt.: 339.4 : 36.5
Status: Custom Synthesis
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