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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
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
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
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
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
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
Indigo-D8
CAT No: VS-A186225
CAS No: NA
Mol.F.: C16H2D8N2O2
Mol.Wt.: 270.32
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
Hydrocortisone D4
CAT No: VS-A186239
CAS No: 73565-87-4
Mol.F.: C21H26D4O5
Mol.Wt.: 366.5
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
Gestodene D6
CAT No: VS-A186263
CAS No: 1542211-40-4
Mol.F.: C21H20D6O2
Mol.Wt.: 316.5
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
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
Fulvestrant D3
CAT No: VS-A186312
CAS No: NA
Mol.F.: C32H44D3F5O3S
Mol.Wt.: 609.8
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
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
Fingolimod-D4 Hydrochloride
CAT No: VS-A186349
CAS No: 1346604-90-7
Mol.F.: C19H30D4ClNO2
Mol.Wt.: 347.96
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
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
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
Ketamine-D8
CAT No: VS-A186394
CAS No: 1073255-31-8
Mol.F.: C13H8D8ClNO
Mol.Wt.: 245.77
Status: Custom Synthesis
Iodobenzene-d5
CAT No: VS-A186399
CAS No: 7379-67-1
Mol.F.: C6D5I
Mol.Wt.: 209.04
Status: Custom Synthesis
Guaiacol-D3
CAT No: VS-A186453
CAS No: 74495-69-5
Mol.F.: C7H5D3O2
Mol.Wt.: 127.16
Status: Custom Synthesis
Homovanillic Acid D3
CAT No: VS-A186458
CAS No: 74495-71-9
Mol.F.: C9H7D3O4
Mol.Wt.: 185.19
Status: Custom Synthesis
Ethylvanillin-D5
CAT No: VS-A186460
CAS No: 1335401-74-5
Mol.F.: C9H5D5O3
Mol.Wt.: 171.2
Status: Custom Synthesis
Fluphenazine-D8 Dihydrochloride
CAT No: VS-A186466
CAS No: NA
Mol.F.: C22H18D8F3N3OS : 2(HCl)
Mol.Wt.: 445.6 : 2(36.5)
Status: Custom Synthesis
Eugenol-D3
CAT No: VS-A186472
CAS No: 1335401-17-6
Mol.F.: C10H9D3O2
Mol.Wt.: 167.22
Status: Custom Synthesis
Imipramine-D6
CAT No: VS-A186478
CAS No: 65100-45-0
Mol.F.: C19H18D6N2
Mol.Wt.: 286.44
Status: Custom Synthesis
Indole-3-acetic-α,α-d2 acid
CAT No: VS-A186484
CAS No: 24420-86-8
Mol.F.: C10H7D2NO2
Mol.Wt.: 177.2
Status: Custom Synthesis
Ethyl-d5 3-aminobenzoate methanesulfonate
CAT No: VS-A186485
CAS No: NA
Mol.F.: C10H10D5NO5S
Mol.Wt.: 266.32
Status: Custom Synthesis
Glycidyl Stearate-D5
CAT No: VS-A186490
CAS No: 1346598-19-3
Mol.F.: C21H35D5O3
Mol.Wt.: 345.57
Status: Custom Synthesis
Iodoethane-D5
CAT No: VS-A186491
CAS No: 6485-58-1
Mol.F.: C2D5I
Mol.Wt.: 161.0
Status: Custom Synthesis
Iso-propyl-1,1,1,3,3,3-d6-amine HCl
CAT No: VS-A186503
CAS No: 126794-59-0
Mol.F.: C3H4D6ClN
Mol.Wt.: 101.61
Status: Custom Synthesis
Isopropyl-d6-amine
CAT No: VS-A186504
CAS No: 55432-59-2
Mol.F.: C3H3D6N
Mol.Wt.: 65.15
Status: Custom Synthesis
Ethyl-d5-boronic acid
CAT No: VS-A186516
CAS No: 2241867-57-0
Mol.F.: C2H7BO2
Mol.Wt.: 73.89
Status: Custom Synthesis
Isoprocarb-D3
CAT No: VS-A186530
CAS No: 2662756-69-4
Mol.F.: C11H12D3NO2
Mol.Wt.: 196.26
Status: Custom Synthesis
Fenobucarb-D3
CAT No: VS-A186532
CAS No: 2662756-72-9
Mol.F.: C12H14D3NO2
Mol.Wt.: 210.29
Status: Custom Synthesis
Ethiofencarb-D3
CAT No: VS-A186534
CAS No: NA
Mol.F.: C11H12D3NO2S
Mol.Wt.: 228.33
Status: Custom Synthesis
Fenuron-D5
CAT No: VS-A186541
CAS No: 1219802-06-8
Mol.F.: C92H5H7N2O
Mol.Wt.: 169.24
Status: Custom Synthesis
Fluometuron-desmethyl-D3
CAT No: VS-A186544
CAS No: NA
Mol.F.: C9H6D3F3N2O
Mol.Wt.: 221.19
Status: Custom Synthesis
Fluometuron-D6
CAT No: VS-A186545
CAS No: 2030182-29-5
Mol.F.: C10H5D6F3N2O
Mol.Wt.: 238.24
Status: Custom Synthesis
Isoproturon D6
CAT No: VS-A186549
CAS No: 1007461-76-8
Mol.F.: C12H12D6N2O
Mol.Wt.: 212.33
Status: Custom Synthesis
Forchlorfenuron D5
CAT No: VS-A186563
CAS No: 1398065-87-6
Mol.F.: C12H5D5ClN3O
Mol.Wt.: 252.71
Status: Custom Synthesis
Etoxazole-D5
CAT No: VS-A186570
CAS No: NA
Mol.F.: C21H18D5F2NO2
Mol.Wt.: 364.44
Status: Custom Synthesis
Glycerol 1-Oleyl Ether-d5
CAT No: VS-A186595
CAS No: NA
Mol.F.: C21H37D5O3
Mol.Wt.: 347.59
Status: Custom Synthesis
Furazolidone-D4
CAT No: VS-A186640
CAS No: 1217222-76-8
Mol.F.: C8H3D4N3O5
Mol.Wt.: 229.18
Status: Custom Synthesis
Furaltadone-D5
CAT No: VS-A186644
CAS No: 1015855-64-7
Mol.F.: C13H11D5N4O6
Mol.Wt.: 329.32
Status: Custom Synthesis
Leucomalachite green D5
CAT No: VS-A186646
CAS No: 947601-82-3
Mol.F.: C23H21D5N2
Mol.Wt.: 335.5
Status: Custom Synthesis
Leucomalachite Green-d6
CAT No: VS-A186647
CAS No: 1173021-13-0
Mol.F.: C23H20D6N2
Mol.Wt.: 336.51
Status: Custom Synthesis
Leuco Gentian Violet-D6
CAT No: VS-A186649
CAS No: 1173023-92-1
Mol.F.: C25H25D6N3
Mol.Wt.: 379.57
Status: Custom Synthesis
Hydroxy Metronidazole D4
CAT No: VS-A186676
CAS No: 1215071-08-1
Mol.F.: C6H5D4N3O4
Mol.Wt.: 191.2
Status: Custom Synthesis
Hydroxy Dimetridazole-D3
CAT No: VS-A186680
CAS No: 1015855-78-3
Mol.F.: C5H4D3N3O3
Mol.Wt.: 160.15
Status: Custom Synthesis
Hydroxy Ipronidazole-d3
CAT No: VS-A186683
CAS No: 1156508-86-9
Mol.F.: C7H8D3N3O3
Mol.Wt.: 188.2
Status: Custom Synthesis
Ipronidazole D3
CAT No: VS-A186684
CAS No: 1015855-83-0
Mol.F.: C7H8D3N3O2
Mol.Wt.: 172.2
Status: Custom Synthesis
Guanfacine-d2 hydrochloride
CAT No: VS-A186686
CAS No: 1398065-88-7
Mol.F.: C9H8D2Cl3N3O
Mol.Wt.: 284.57
Status: Custom Synthesis
Fenbendazole D3
CAT No: VS-A186689
CAS No: 1228182-47-5
Mol.F.: C15H10D3N3O2S
Mol.Wt.: 302.37
Status: Custom Synthesis
Fenbendazole Sulfoxide D3
CAT No: VS-A186690
CAS No: 1228182-54-4
Mol.F.: C15H10D3N3O3S
Mol.Wt.: 318.37
Status: Custom Synthesis
Fenbendazole sulfone D3
CAT No: VS-A186691
CAS No: 1228182-49-7
Mol.F.: C15H10D3N3O4S
Mol.Wt.: 334.36
Status: Custom Synthesis
Hydroxy Metronidazole D2
CAT No: VS-A186694
CAS No: 2196180-19-3
Mol.F.: C6H7D2N3O4
Mol.Wt.: 189.2
Status: Custom Synthesis
Florfenicol-D3
CAT No: VS-A186697
CAS No: 2213400-85-0
Mol.F.: C12H11D3Cl2FNO4S
Mol.Wt.: 361.23
Status: Custom Synthesis
Florfenicol amine-D3- (methyl-D3)
CAT No: VS-A186698
CAS No: 3023974-39-9
Mol.F.: C10H11D3FNO3S
Mol.Wt.: 250.30
Status: Custom Synthesis
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