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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.
Hydroxy Bupropion-d6
CAT No: VS-A186021
CAS No: 1216893-18-3
Mol.F.: C13H12D6ClNO2
Mol.Wt.: 261.78
Status: In Stock
Gliclazide D4
CAT No: VS-A186063
CAS No: 1185039-30-8
Mol.F.: C15H17D4N3O3S
Mol.Wt.: 327.4
Status: In Stock
Granisetron D3
CAT No: VS-A186064
CAS No: 1224925-76-1
Mol.F.: C18H21D3N4O
Mol.Wt.: 315.4
Status: In Stock
Hydroxychloroquine-D5
CAT No: VS-A186065
CAS No: NA
Mol.F.: C18H21D5ClN3O
Mol.Wt.: 340.91
Status: In Stock
Ibrutinib-d5
CAT No: VS-A186066
CAS No: 1553977-17-5
Mol.F.: C25H19D5N6O2
Mol.Wt.: 445.5
Status: In Stock
Ibuprofen D3
CAT No: VS-A186067
CAS No: 121662-14-4
Mol.F.: C13H15D3O2
Mol.Wt.: 209.3
Status: In Stock
Imatinib D3
CAT No: VS-A186068
CAS No: 1134803-18-1
Mol.F.: C29H28D3N7O
Mol.Wt.: 496.6
Status: In Stock
Ivosidenib-D4
CAT No: VS-A186069
CAS No: NA
Mol.F.: C28H18D4ClF3N6O3
Mol.Wt.: 586.99
Status: In Stock
Lacosamide D3
CAT No: VS-A186071
CAS No: 1217689-95-6
Mol.F.: C13H15D3N2O3
Mol.Wt.: 253.3
Status: In Stock
Lacosamide D6
CAT No: VS-A186072
CAS No: 1219042-77-9
Mol.F.: C13H12D6N2O3
Mol.Wt.: 256.3
Status: In Stock
Losartan Impurity 21-D4
CAT No: VS-A186076
CAS No: NA
Mol.F.: C22H18D4ClN9
Mol.Wt.: 451.96
Status: In Stock
Macitentan D4
CAT No: VS-A186077
CAS No: 1258428-05-5
Mol.F.: C19H16D4Br2N6O4S
Mol.Wt.: 592.3
Status: In Stock
Mebeverine Acid D5
CAT No: VS-A186078
CAS No: 2070015-30-2
Mol.F.: C16H20D5NO3
Mol.Wt.: 284.4
Status: In Stock
Manidipine-d4
CAT No: VS-A186079
CAS No: 1189656-59-4
Mol.F.: C35H34D4N4O6
Mol.Wt.: 614.72
Status: In Stock
Metaxalone D6
CAT No: VS-A186081
CAS No: 1189944-95-3
Mol.F.: C12H9D6NO3
Mol.Wt.: 227.3
Status: In Stock
Methimazole-d3
CAT No: VS-A186082
CAS No: 1160932-07-9
Mol.F.: C4H3D3N2S
Mol.Wt.: 117.19
Status: In Stock
Methotrexate D3
CAT No: VS-A186083
CAS No: 432545-63-6
Mol.F.: C20H19D3N8O5
Mol.Wt.: 457.5
Status: In Stock
Metoclopramide D3
CAT No: VS-A186084
CAS No: 1216522-89-2
Mol.F.: C14H19D3ClN3O2
Mol.Wt.: 302.8
Status: In Stock
Metopimazine-d6
CAT No: VS-A186085
CAS No: 1215315-86-8
Mol.F.: C22H21D6N3O3S2
Mol.Wt.: 451.63
Status: In Stock
Midodrine D6
CAT No: VS-A186086
CAS No: 1188331-46-5
Mol.F.: C12H12D6N2O4
Mol.Wt.: 260.3
Status: In Stock
Minoxidil D10
CAT No: VS-A186087
CAS No: 1020718-66-4
Mol.F.: C9H5D10N5O
Mol.Wt.: 219.3
Status: In Stock
Monomethyl Fumarate D5
CAT No: VS-A186088
CAS No: 1616345-45-9
Mol.F.: C5HD5O4
Mol.Wt.: 135.1
Status: In Stock
Nadolol D9
CAT No: VS-A186089
CAS No: 94513-92-5
Mol.F.: C17H18D9NO4
Mol.Wt.: 318.5
Status: In Stock
Nintedanib-D3
CAT No: VS-A186091
CAS No: 1624587-84-3
Mol.F.: C31H30D3N5O4
Mol.Wt.: 542.64
Status: In Stock
Nirmatrelvir D9
CAT No: VS-A186092
CAS No: 2861202-76-6
Mol.F.: C23H23D9F3N5O4
Mol.Wt.: 508.6
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
Nitroso-STG-19 (Sitagliptin)-6,6,8,8-d4
CAT No: VS-A186167
CAS No: NA
Mol.F.: C6H2D4F3N5O
Mol.Wt.: 225.17
Status: In Stock
N-Nitroso-di-n-butylamine-d18
CAT No: VS-A186180
CAS No: 1219798-82-9
Mol.F.: C8D18N2O
Mol.Wt.: 176.4
Status: In Stock
N-Benzyl N-Demethyl Trimebutine-d5
CAT No: VS-A186182
CAS No: 1330189-05-3
Mol.F.: C28H28D5NO5
Mol.Wt.: 468.6
Status: Custom Synthesis
Glycyrrhetic Acid-d3
CAT No: VS-A186187
CAS No: 1155424-19-3
Mol.F.: C30H43D3O4
Mol.Wt.: 473.70
Status: Custom Synthesis
Hydroxyzine D8
CAT No: VS-A186192
CAS No: 1189480-47-4
Mol.F.: C21H19D8ClN2O2
Mol.Wt.: 383.00
Status: Custom Synthesis
N-Nitroso Deucravacitinib D3
CAT No: VS-A186193
CAS No: NA
Mol.F.: C20H18D3N9O4
Mol.Wt.: 454.5
Status: Custom Synthesis
Levofloxacin D8
CAT No: VS-A186194
CAS No: 1217716-71-6
Mol.F.: C18H12D8FN3O4
Mol.Wt.: 369.4
Status: Custom Synthesis
Levoketoconazole D3
CAT No: VS-A186198
CAS No: NA
Mol.F.: C26H25D3Cl2N4O4
Mol.Wt.: 534.5
Status: Custom Synthesis
N-Nitroso Trimetazidine EP Impurity G D8
CAT No: VS-A186203
CAS No: 1330180-56-7
Mol.F.: C4HD8N3O
Mol.Wt.: 123.2
Status: Custom Synthesis
Loxoprofen-d3
CAT No: VS-A186206
CAS No: NA
Mol.F.: C15H15D3O3
Mol.Wt.: 249.32
Status: Custom Synthesis
Levonorgestrel-d6
CAT No: VS-A186209
CAS No: 2376035-98-0
Mol.F.: C21H22D6O2
Mol.Wt.: 318.48
Status: Custom Synthesis
Lercanidipine D3
CAT No: VS-A186215
CAS No: 1190043-34-5
Mol.F.: C36H38D3N3O6
Mol.Wt.: 614.8
Status: Custom Synthesis
Lercanidipine D3 Hydrochloride
CAT No: VS-A186216
CAS No: 1189954-18-4
Mol.F.: C36H38D3N3O6 : HCl
Mol.Wt.: 614.8 : 36.5
Status: Custom Synthesis
Hydroxy Bezafibrate-D6
CAT No: VS-A186219
CAS No: NA
Mol.F.: C19H14D6NO5
Mol.Wt.: 383.76
Status: Custom Synthesis
Nicardipine D3 Hydrochloride
CAT No: VS-A186224
CAS No: 1432061-50-1
Mol.F.: C26H26D3N3O6 : HCl
Mol.Wt.: 482.6 : 36.5
Status: Custom Synthesis
Indigo-D8
CAT No: VS-A186225
CAS No: NA
Mol.F.: C16H2D8N2O2
Mol.Wt.: 270.32
Status: Custom Synthesis
Hydrocortisone D4
CAT No: VS-A186239
CAS No: 73565-87-4
Mol.F.: C21H26D4O5
Mol.Wt.: 366.5
Status: Custom Synthesis
Methsuximide-d5
CAT No: VS-A186242
CAS No: 1189980-63-9
Mol.F.: C12H8D5NO2
Mol.Wt.: 208.27
Status: Custom Synthesis
Norethindrone Acetate-D6
CAT No: VS-A186243
CAS No: NA
Mol.F.: C22H22D6O3
Mol.Wt.: 346.5
Status: Custom Synthesis
Norethindrone-D6
CAT No: VS-A186245
CAS No: 2376036-05-2
Mol.F.: C20H20D6O2
Mol.Wt.: 304.5
Status: Custom Synthesis
Memantine-d3 Hydrochloride
CAT No: VS-A186248
CAS No: 1329802-06-3
Mol.F.: C12H18D3N : HCl
Mol.Wt.: 182.33 : 36.5
Status: Custom Synthesis
Memantine-D6 Hydrochloride
CAT No: VS-A186249
CAS No: 1189713-18-5
Mol.F.: C12H15D6N : HCl
Mol.Wt.: 185.3 : 36.5
Status: Custom Synthesis
Norgestimate-D8 (major)
CAT No: VS-A186253
CAS No: NA
Mol.F.: C23H23D8NO3
Mol.Wt.: 377.56
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
Normesuximide-D5
CAT No: VS-A186264
CAS No: 1185130-51-1
Mol.F.: C11H6D5NO2
Mol.Wt.: 194.24
Status: Custom Synthesis
Norphensuximide-D5
CAT No: VS-A186265
CAS No: NA
Mol.F.: C10H4D5NO2
Mol.Wt.: 180.22
Status: Custom Synthesis
Montelukast-D6 Sodium Salt
CAT No: VS-A186273
CAS No: 2673270-26-1
Mol.F.: C35H29D6ClNO3S : Na
Mol.Wt.: 591.2 : 23.0
Status: Custom Synthesis
N-Acetyl Norgestimate-d6
CAT No: VS-A186281
CAS No: 1263195-02-3
Mol.F.: C25H27D6NO4
Mol.Wt.: 417.57
Status: Custom Synthesis
Mesalazine-d3 Hydrochloride
CAT No: VS-A186296
CAS No: 1346601-18-0
Mol.F.: C7H5D3ClNO3
Mol.Wt.: 192.61
Status: Custom Synthesis
Nor Verapamil-D7 Hydrochloride
CAT No: VS-A186298
CAS No: 1216413-74-9
Mol.F.: C26H30D7ClN2O4
Mol.Wt.: 484.08
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
Metronidazole D4
CAT No: VS-A186307
CAS No: 1261392-47-5
Mol.F.: C6H5D4N3O3
Mol.Wt.: 175.2
Status: Custom Synthesis
Metronidazole D4 Hydrochloride
CAT No: VS-A186308
CAS No: 1261397-74-3
Mol.F.: C6H5D4N3O3 : HCl
Mol.Wt.: 175.2 : 36.5
Status: Custom Synthesis
N-Hydroxy (E)-2-(4-methoxybenzoxy-D6)-4-methoxy-3-prenylcinnamamide
CAT No: VS-A186316
CAS No: NA
Mol.F.: C23H21D6NO5
Mol.Wt.: 403.51
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
O-Desmethyl Venlafaxine-d10
CAT No: VS-A186318
CAS No: 1062607-49-1
Mol.F.: C16H15D10NO2
Mol.Wt.: 273.44
Status: Custom Synthesis
Levonorgestrel-D8
CAT No: VS-A186321
CAS No: NA
Mol.F.: C21H20D8O2
Mol.Wt.: 320.5
Status: Custom Synthesis
Hydroxy Tyrosol-D5
CAT No: VS-A186333
CAS No: NA
Mol.F.: C8H5D5O3
Mol.Wt.: 159.13
Status: Custom Synthesis
Lansoprazole-D4 Sulfone N-Oxide
CAT No: VS-A186336
CAS No: 1190009-70-1
Mol.F.: C18H10D4F3N3O4S
Mol.Wt.: 405.38
Status: Custom Synthesis
Lansoprazole Sulfide-D4
CAT No: VS-A186341
CAS No: 1216682-38-0
Mol.F.: C18H10D4F3N3OS
Mol.Wt.: 357.39
Status: Custom Synthesis
Lansoprazole Sulfone-D4
CAT No: VS-A186342
CAS No: 1184999-77-6
Mol.F.: C16H10D4F3N3O3S
Mol.Wt.: 389.39
Status: Custom Synthesis
N-Acetyl Clonidine-D4
CAT No: VS-A186344
CAS No: NA
Mol.F.: C11H7D4Cl2N3O
Mol.Wt.: 276.08
Status: Custom Synthesis
N-Acetyl Tizanidine-d4
CAT No: VS-A186345
CAS No: 1276602-33-5
Mol.F.: C11H6D4ClN5OS
Mol.Wt.: 299.77
Status: Custom Synthesis
Norethindrone Acetate D8
CAT No: VS-A186352
CAS No: NA
Mol.F.: C22H20D8O3
Mol.Wt.: 348.5
Status: Custom Synthesis
Metoprolol EP Impurity O-D7 Hydrochloride
CAT No: VS-A186354
CAS No: 2673270-18-1
Mol.F.: C27H35D7ClNO6
Mol.Wt.: 519.13
Status: Custom Synthesis
Glycochenodeoxycholic Acid-D4
CAT No: VS-A186355
CAS No: 1201918-16-2
Mol.F.: C26H39D4NO5
Mol.Wt.: 453.65
Status: Custom Synthesis
Glycodeoxycholic Acid-D4
CAT No: VS-A186356
CAS No: 1069132-37-1
Mol.F.: C26H39D4NO5
Mol.Wt.: 453.65
Status: Custom Synthesis
Glycolithocholic Acid-D4
CAT No: VS-A186357
CAS No: 2044276-16-4
Mol.F.: C26H39D4NO4
Mol.Wt.: 437.65
Status: Custom Synthesis
Glycoursodeoxycholic Acid-D4
CAT No: VS-A186358
CAS No: 2044276-17-5
Mol.F.: C26H39D4NO5
Mol.Wt.: 453.7
Status: Custom Synthesis
Lansoprazole D4
CAT No: VS-A186359
CAS No: 934294-22-1
Mol.F.: C16H10D4F3N3O2S
Mol.Wt.: 373.4
Status: Custom Synthesis
Norgestimate-D6
CAT No: VS-A186371
CAS No: 1263194-12-2
Mol.F.: C23H25D6NO3
Mol.Wt.: 375.5
Status: Custom Synthesis
O-Desmethyl Venlafaxine D6
CAT No: VS-A186377
CAS No: 1062605-69-9
Mol.F.: C16H19D6NO2
Mol.Wt.: 269.4
Status: Custom Synthesis
Metoprolol-D7 Hydrochloride
CAT No: VS-A186381
CAS No: 1219798-61-4
Mol.F.: C15H19D7ClNO3
Mol.Wt.: 310.87
Status: Custom Synthesis
Loratadine D5
CAT No: VS-A186384
CAS No: 1398065-63-8
Mol.F.: C22H18D5ClN2O2
Mol.Wt.: 387.92
Status: Custom Synthesis
N-Desmethyl Sildenafil D8
CAT No: VS-A186385
CAS No: 1185168-06-2
Mol.F.: C21H20D8N6O4S
Mol.Wt.: 468.6
Status: Custom Synthesis
Norethindrone D8
CAT No: VS-A186387
CAS No: NA
Mol.F.: C20H18D8O2
Mol.Wt.: 306.5
Status: Custom Synthesis
Loxapine-d8 Hydrochloride
CAT No: VS-A186389
CAS No: 1246820-19-8
Mol.F.: C18H11D8Cl2N3O
Mol.Wt.: 372.32
Status: Custom Synthesis
Ketamine-D8
CAT No: VS-A186394
CAS No: 1073255-31-8
Mol.F.: C13H8D8ClNO
Mol.Wt.: 245.77
Status: Custom Synthesis
N-Nitroso Bisoprolol-D5
CAT No: VS-A186395
CAS No: NA
Mol.F.: C18H25D5N2O5
Mol.Wt.: 359.5
Status: Custom Synthesis
N-Nitrosodi-Iso-Propyl-d14-Amine
CAT No: VS-A186396
CAS No: 2975202-11-8
Mol.F.: C6D14N2O
Mol.Wt.: 144.3
Status: Custom Synthesis
N-Nitroso Sitagliptin Amine-d4
CAT No: VS-A186397
CAS No: NA
Mol.F.: C6H2D4F3N5O
Mol.Wt.: 225.2
Status: Custom Synthesis
N-Nitroso Rasagiline-D4
CAT No: VS-A186398
CAS No: NA
Mol.F.: C9H7D4N3O
Mol.Wt.: 181.23
Status: Custom Synthesis
Iodobenzene-d5
CAT No: VS-A186399
CAS No: 7379-67-1
Mol.F.: C6D5I
Mol.Wt.: 209.04
Status: Custom Synthesis
Naphthalene D8
CAT No: VS-A186409
CAS No: 1146-65-2
Mol.F.: C10D8
Mol.Wt.: 136.22
Status: Custom Synthesis
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