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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.
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
Fedratinib D9
CAT No: VS-A186057
CAS No: 2226875-48-3
Mol.F.: C27H27D9N6O3S
Mol.Wt.: 533.7
Status: In Stock
Fingolimod D4
CAT No: VS-A186058
CAS No: 1346747-38-3
Mol.F.: C19H29D4NO2
Mol.Wt.: 311.5
Status: In Stock
Fluphenazine-D6
CAT No: VS-A186059
CAS No: NA
Mol.F.: C22H20D6F3N3OS
Mol.Wt.: 443.56
Status: In Stock
Flurbiprofen-d3
CAT No: VS-A186060
CAS No: 1185133-81-6
Mol.F.: C15H10D3FO2
Mol.Wt.: 247.28
Status: In Stock
Gefitinib D3
CAT No: VS-A186061
CAS No: 1173976-40-3
Mol.F.: C22H21D3ClFN4O3
Mol.Wt.: 449.9
Status: In Stock
Clonazepam D4
CAT No: VS-A186158
CAS No: 170082-15-2
Mol.F.: C15H6D4ClN3O3
Mol.Wt.: 319.7
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
Furosemide-d5
CAT No: VS-A186171
CAS No: 1189482-35-6
Mol.F.: C12H6D5ClN2O5S
Mol.Wt.: 335.8
Status: In Stock
Fidaxomicin Metabolite OP-1118 D6
CAT No: VS-A186172
CAS No: NA
Mol.F.: C48H62D6Cl2O17
Mol.Wt.: 993.99
Status: In Stock
Ezetimibe D4
CAT No: VS-A186176
CAS No: 1093659-90-5
Mol.F.: C24H17D4F2NO3
Mol.Wt.: 413.5
Status: In Stock
Ezetimibe Phenoxy Glucuronide D4
CAT No: VS-A186177
CAS No: 1426174-41-5
Mol.F.: C30H25D4F2NO9
Mol.Wt.: 589.6
Status: In Stock
Deucravacitinib
CAT No: VS-A186183
CAS No: 1609392-27-9
Mol.F.: C20H19D3N8O3
Mol.Wt.: 425.47
Status: Custom Synthesis
Cetirizine D4
CAT No: VS-A186191
CAS No: 1219803-84-5
Mol.F.: C21H21D4ClN2O3
Mol.Wt.: 392.9
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
Eplerenone D3
CAT No: VS-A186205
CAS No: NA
Mol.F.: C24H27D3O6
Mol.Wt.: 417.5
Status: Custom Synthesis
Dydrogesterone-d6
CAT No: VS-A186220
CAS No: NA
Mol.F.: C21H22D6O2
Mol.Wt.: 318.5
Status: Custom Synthesis
Flunisolide Acetate-D6
CAT No: VS-A186226
CAS No: NA
Mol.F.: C26H27D6FO7
Mol.Wt.: 482.57
Status: Custom Synthesis
Flunisolide-d6
CAT No: VS-A186227
CAS No: NA
Mol.F.: C24H25D6FO6
Mol.Wt.: 440.53
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
Clobetasol 17-Propionate-d5
CAT No: VS-A186241
CAS No: 2280940-18-1
Mol.F.: C25H27D5ClFO5
Mol.Wt.: 472
Status: Custom Synthesis
Formoterol-D6 (Major) (Mixture of Diastereomers)
CAT No: VS-A186246
CAS No: 1020719-45-2
Mol.F.: C19H18D6N2O4
Mol.Wt.: 350.44
Status: Custom Synthesis
Formoterol-D6 Fumarate
CAT No: VS-A186247
CAS No: NA
Mol.F.: C19H18D6N2O4 : C4H4O4
Mol.Wt.: 350.4 : 116.1
Status: Custom Synthesis
Dolutegravir D3
CAT No: VS-A186262
CAS No: 2673270-25-0
Mol.F.: C20H16D3F2N3O5
Mol.Wt.: 422.4
Status: Custom Synthesis
Gestodene D6
CAT No: VS-A186263
CAS No: 1542211-40-4
Mol.F.: C21H20D6O2
Mol.Wt.: 316.5
Status: Custom Synthesis
Chlorthalidone D4
CAT No: VS-A186267
CAS No: 1794941-44-8
Mol.F.: C14H7D4ClN2O4S
Mol.Wt.: 342.8
Status: Custom Synthesis
Fludrocortisone-D6
CAT No: VS-A186277
CAS No: NA
Mol.F.: C21H23D6FO5
Mol.Wt.: 386.49
Status: Custom Synthesis
Fulvestrant-9-Sulfone-D3
CAT No: VS-A186278
CAS No: NA
Mol.F.: C32H44D3F5O4S
Mol.Wt.: 625.79
Status: Custom Synthesis
Fulvestrant-D5
CAT No: VS-A186279
CAS No: NA
Mol.F.: C32H42D5F5O3S
Mol.Wt.: 611.81
Status: Custom Synthesis
Deflazacort-D7
CAT No: VS-A186286
CAS No: NA
Mol.F.: C25H24D7NO6
Mol.Wt.: 448.57
Status: Custom Synthesis
Deflazacort-D5
CAT No: VS-A186288
CAS No: NA
Mol.F.: C25H26D5NO6
Mol.Wt.: 446.55
Status: Custom Synthesis
Budesonide D8
CAT No: VS-A186289
CAS No: 1105542-94-6
Mol.F.: C25H26D8O6
Mol.Wt.: 438.6
Status: Custom Synthesis
Etonogestrel D6
CAT No: VS-A186292
CAS No: NA
Mol.F.: C22H22D6O2
Mol.Wt.: 330.5
Status: Custom Synthesis
Finasteride-D9
CAT No: VS-A186293
CAS No: 1131342-85-2
Mol.F.: C23H27D9N2O2
Mol.Wt.: 381.60
Status: Custom Synthesis
Fingolimod Phosphate D4
CAT No: VS-A186294
CAS No: 1794828-93-5
Mol.F.: C19H30D4NO5P
Mol.Wt.: 391.5
Status: Custom Synthesis
Cyclosporin A-D4
CAT No: VS-A186303
CAS No: NA
Mol.F.: C62H107D4N11O12
Mol.Wt.: 1206.7
Status: Custom Synthesis
Dehydro Cyclosporin A-D4
CAT No: VS-A186304
CAS No: NA
Mol.F.: C62H105D4N11O11
Mol.Wt.: 1188.62
Status: Custom Synthesis
Budesonide Impurity 1-d8
CAT No: VS-A186310
CAS No: NA
Mol.F.: C25H24D8O7
Mol.Wt.: 452.57
Status: Custom Synthesis
Deflazacort-D3
CAT No: VS-A186311
CAS No: 2280940-17-0
Mol.F.: C25H28D3NO6
Mol.Wt.: 444.54
Status: Custom Synthesis
Fulvestrant D3
CAT No: VS-A186312
CAS No: NA
Mol.F.: C32H44D3F5O3S
Mol.Wt.: 609.8
Status: Custom Synthesis
Canrenone-D7
CAT No: VS-A186314
CAS No: NA
Mol.F.: C22H21D7O3
Mol.Wt.: 347.51
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
Clonidine D4
CAT No: VS-A186326
CAS No: 62497-68-1
Mol.F.: C9H5D4Cl2N3
Mol.Wt.: 234.1
Status: Custom Synthesis
Delamanid D4
CAT No: VS-A186327
CAS No: 2747917-54-8
Mol.F.: C25H21D4F3N4O6
Mol.Wt.: 538.5
Status: Custom Synthesis
Febuxostat D9
CAT No: VS-A186329
CAS No: 1246819-50-0
Mol.F.: C16H7D9N2O3S
Mol.Wt.: 325.4
Status: Custom Synthesis
Fludrocortisone Acetate-D6
CAT No: VS-A186330
CAS No: NA
Mol.F.: C23H25D6FO6
Mol.Wt.: 428.53
Status: Custom Synthesis
Donepezil-D7 Hydrochloride
CAT No: VS-A186343
CAS No: 1261394-20-0
Mol.F.: C24H23D7ClNO3
Mol.Wt.: 423.0
Status: Custom Synthesis
Cyclosporin A-D4 Acetate
CAT No: VS-A186347
CAS No: NA
Mol.F.: C64H109D4N11O13
Mol.Wt.: 1248.67
Status: Custom Synthesis
Fingolimod-D4 Hydrochloride
CAT No: VS-A186349
CAS No: 1346604-90-7
Mol.F.: C19H30D4ClNO2
Mol.Wt.: 347.96
Status: Custom Synthesis
Clonidine D4 Hydrochloride
CAT No: VS-A186353
CAS No: 67151-02-4
Mol.F.: C9H5D4Cl2N3 : HCl
Mol.Wt.: 234.1 : 36.5
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
Ethynyl Estradiol-2,4,16,16-d4
CAT No: VS-A186368
CAS No: 350820-06-3
Mol.F.: C20H20D4O2
Mol.Wt.: 300.4
Status: Custom Synthesis
Exemestane D2
CAT No: VS-A186369
CAS No: NA
Mol.F.: C20H22D2O2
Mol.Wt.: 298.4
Status: Custom Synthesis
Desipramine-2,4,6,8-d4 Hydrochloride
CAT No: VS-A186378
CAS No: 61361-34-0
Mol.F.: C18H18D4N2 : HCl
Mol.Wt.: 270.4 : 36.5
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
Deoxycholic Acid-D4
CAT No: VS-A186380
CAS No: 112076-61-6
Mol.F.: C24H36D4O4
Mol.Wt.: 396.6
Status: Custom Synthesis
Ethosuximide D5
CAT No: VS-A186383
CAS No: 1989660-59-4
Mol.F.: C7H6D5NO2
Mol.Wt.: 146.2
Status: Custom Synthesis
Estradiol D4
CAT No: VS-A186386
CAS No: 66789-03-5
Mol.F.: C18H20D4O2
Mol.Wt.: 276.4
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
Bromobenzene D5
CAT No: VS-A186393
CAS No: 4165-57-5
Mol.F.: C6D5Br
Mol.Wt.: 162.04
Status: Custom Synthesis
Carbazole D8
CAT No: VS-A186419
CAS No: 38537-24-5
Mol.F.: C12HD8N
Mol.Wt.: 175.26
Status: Custom Synthesis
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