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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
Cyclizine D3
CAT No: VS-A186031
CAS No: 1170155-67-5
Mol.F.: C18H19D3N2
Mol.Wt.: 269.41
Status: In Stock
Cyclosporin D4
CAT No: VS-A186032
CAS No: NA
Mol.F.: C62H107D4N11O12
Mol.Wt.: 1206.64
Status: In Stock
Cyproterone Acetate D3
CAT No: VS-A186033
CAS No: NA
Mol.F.: C24H26D3ClO4
Mol.Wt.: 419.96
Status: In Stock
Dabigatran D4
CAT No: VS-A186034
CAS No: 1618637-32-3
Mol.F.: C25H21D4N7O3
Mol.Wt.: 475.54
Status: In Stock
Daclatasvir-D6
CAT No: VS-A186035
CAS No: 1801709-41-0
Mol.F.: C40H44D6N8O6
Mol.Wt.: 744.91
Status: In Stock
Dapagliflozin-D5
CAT No: VS-A186036
CAS No: 1204219-80-6
Mol.F.: C21H20D5ClO6
Mol.Wt.: 413.9
Status: In Stock
Darolutamide D4
CAT No: VS-A186037
CAS No: NA
Mol.F.: C19H15D4ClN6O2
Mol.Wt.: 402.9
Status: In Stock
Dasatinib-d4
CAT No: VS-A186038
CAS No: 1160297-08-4
Mol.F.: C22H22D4ClN7O2S
Mol.Wt.: 492.01
Status: In Stock
Deferasirox-d4
CAT No: VS-A186039
CAS No: 1133425-75-8
Mol.F.: C21H11D4N3O4
Mol.Wt.: 377.39
Status: In Stock
Diazoxide-d3
CAT No: VS-A186041
CAS No: 1432063-51-8
Mol.F.: C8H4D3ClN2O2S
Mol.Wt.: 233.69
Status: In Stock
Digoxin D3
CAT No: VS-A186042
CAS No: 127299-95-0
Mol.F.: C41H61O14D3
Mol.Wt.: 783.96
Status: In Stock
Diltiazem D4
CAT No: VS-A186043
CAS No: 112259-41-3
Mol.F.: C22H22D4N2O4S
Mol.Wt.: 418.5
Status: In Stock
Dipyridamole D20
CAT No: VS-A186044
CAS No: 1189983-52-5
Mol.F.: C24H20D20N8O4
Mol.Wt.: 524.8
Status: In Stock
Domperidone D6
CAT No: VS-A186045
CAS No: 1329614-18-7
Mol.F.: C22H18D6ClN5O2
Mol.Wt.: 432
Status: In Stock
Doxazosin D8
CAT No: VS-A186046
CAS No: 1126848-44-9
Mol.F.: C23H17D8N5O5
Mol.Wt.: 459.5
Status: In Stock
Edoxaban D6
CAT No: VS-A186048
CAS No: 1304701-57-2
Mol.F.: C24H24D6ClN7O4S
Mol.Wt.: 554.1
Status: In Stock
Eliglustat – D15
CAT No: VS-A186050
CAS No: NA
Mol.F.: C23H21D15N2O4
Mol.Wt.: 419.64
Status: In Stock
Enzalutamide D3
CAT No: VS-A186051
CAS No: 1443331-82-5
Mol.F.: C21H13D3F4N4O2S
Mol.Wt.: 467.5
Status: In Stock
Enzalutamide-D6
CAT No: VS-A186052
CAS No: 1443331-94-9
Mol.F.: C21H10D6F4N4O2S
Mol.Wt.: 470.5
Status: In Stock
Erlotinib D6
CAT No: VS-A186053
CAS No: 1034651-23-4
Mol.F.: C22H17D6N3O4
Mol.Wt.: 399.5
Status: In Stock
Escitalopram D3 oxalate
CAT No: VS-A186054
CAS No: NA
Mol.F.: C22H20D3FN2O5
Mol.Wt.: 417.45
Status: In Stock
Clonazepam D4
CAT No: VS-A186158
CAS No: 170082-15-2
Mol.F.: C15H6D4ClN3O3
Mol.Wt.: 319.7
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
Efinaconazole D4
CAT No: VS-A186163
CAS No: NA
Mol.F.: C18H18D4F2N4O
Mol.Wt.: 352.42
Status: In Stock
Cabotegravir D3
CAT No: VS-A186164
CAS No: NA
Mol.F.: C19H14D3F2N3O5
Mol.Wt.: 408.4
Status: In Stock
Colchicine-D6
CAT No: VS-A186168
CAS No: 1217651-73-4
Mol.F.: C22H19D6NO6
Mol.Wt.: 405.5
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
Deucravacitinib
CAT No: VS-A186183
CAS No: 1609392-27-9
Mol.F.: C20H19D3N8O3
Mol.Wt.: 425.47
Status: Custom Synthesis
(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
Eplerenone D3
CAT No: VS-A186205
CAS No: NA
Mol.F.: C24H27D3O6
Mol.Wt.: 417.5
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
Dydrogesterone-d6
CAT No: VS-A186220
CAS No: NA
Mol.F.: C21H22D6O2
Mol.Wt.: 318.5
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
COTI-219 D8
CAT No: VS-A186230
CAS No: NA
Mol.F.: C17H10D8N6S
Mol.Wt.: 346.48
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
Clobetasol 17-Propionate-d5
CAT No: VS-A186241
CAS No: 2280940-18-1
Mol.F.: C25H27D5ClFO5
Mol.Wt.: 472
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
Dolutegravir D3
CAT No: VS-A186262
CAS No: 2673270-25-0
Mol.F.: C20H16D3F2N3O5
Mol.Wt.: 422.4
Status: Custom Synthesis
Chlorthalidone D4
CAT No: VS-A186267
CAS No: 1794941-44-8
Mol.F.: C14H7D4ClN2O4S
Mol.Wt.: 342.8
Status: Custom Synthesis
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