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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.
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
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
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
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
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
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
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
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
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
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
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 Rasagiline-D4
CAT No: VS-A186398
CAS No: NA
Mol.F.: C9H7D4N3O
Mol.Wt.: 181.23
Status: Custom Synthesis
Naphthalene D8
CAT No: VS-A186409
CAS No: 1146-65-2
Mol.F.: C10D8
Mol.Wt.: 136.22
Status: Custom Synthesis
Methyl D3 Amine Hydrochloride
CAT No: VS-A186445
CAS No: 7436-22-8
Mol.F.: CH3D3ClN
Mol.Wt.: 70.53
Status: Custom Synthesis
N-((5-(2-fluorophenyl)-1-((3-(3-methoxypropoxy)phenyl)sulfonyl)-1H-pyrrol-3-yl)methyl)methan-d3-amine
CAT No: VS-A186449
CAS No: NA
Mol.F.: C22H22D3FN2O4S
Mol.Wt.: 435.53
Status: Custom Synthesis
N-[[4-(Methoxy-d3)phenyl]methyl]-N′-(5-nitro-2-thiazolyl)urea
![Picture of N-[[4-(Methoxy-d3)phenyl]methyl]-N′-(5-nitro-2-thiazolyl)urea](https://venkatasailifesciences.com/content/images/thumbs/0059545_n-4-methoxy-d3phenylmethyl-n-5-nitro-2-thiazolylurea_350.png "Show details for N-[[4-(Methoxy-d3)phenyl]methyl]-N′-(5-nitro-2-thiazolyl)urea")
CAT No: VS-A186450
CAS No: 1216908-63-2
Mol.F.: C12H9D3N4O4S
Mol.Wt.: 311.33
Status: Custom Synthesis
Nabumetone D3
CAT No: VS-A186454
CAS No: 1216770-08-9
Mol.F.: C15H13D3O2
Mol.Wt.: 231.3
Status: Custom Synthesis
Melatonin-D4
CAT No: VS-A186477
CAS No: 66521-38-8
Mol.F.: C13H12D4N2O2
Mol.Wt.: 236.3
Status: Custom Synthesis
Levosulpiride D3
CAT No: VS-A186482
CAS No: 124020-27-5
Mol.F.: C15H20D3N3O4S
Mol.Wt.: 344.4
Status: Custom Synthesis
N-Methyltryptamine-D3
CAT No: VS-A186483
CAS No: 1794756-39-0
Mol.F.: C11H11D3N2
Mol.Wt.: 177.26
Status: Custom Synthesis
Nitrobenzene D5
CAT No: VS-A186496
CAS No: 4165-60-0
Mol.F.: C6D5NO2
Mol.Wt.: 128.14
Status: Custom Synthesis
Methyl-d3 trifluoromethane sulfonate
CAT No: VS-A186518
CAS No: 73900-07-9
Mol.F.: CF3SO3CD3
Mol.Wt.: 167.12
Status: Custom Synthesis
Methiocarb-D3
CAT No: VS-A186525
CAS No: 1581694-94-1
Mol.F.: C11H12D3NO2S
Mol.Wt.: 228.33
Status: Custom Synthesis
Methiocarb sulfoxide-D3
CAT No: VS-A186526
CAS No: NA
Mol.F.: C11H12D3NO3S
Mol.Wt.: 244.33
Status: Custom Synthesis
Methiocarb Sulfone-D3
CAT No: VS-A186527
CAS No: NA
Mol.F.: C11H12D3NO4S
Mol.Wt.: 260.32
Status: Custom Synthesis
Methomyl-D3
CAT No: VS-A186528
CAS No: 1398109-07-3
Mol.F.: C5H7D3N2O2S
Mol.Wt.: 165.23
Status: Custom Synthesis
Metolcarb-D3
CAT No: VS-A186533
CAS No: 1777782-68-9
Mol.F.: C9H8D3NO2
Mol.Wt.: 168.21
Status: Custom Synthesis
Meobal-D3
CAT No: VS-A186535
CAS No: NA
Mol.F.: C10H10D3NO2
Mol.Wt.: 182.24
Status: Custom Synthesis
Linuron-D6
CAT No: VS-A186538
CAS No: 1219804-76-8
Mol.F.: C9H4D6Cl2N2O2
Mol.Wt.: 255.13
Status: Custom Synthesis
Monolinuron-D6
CAT No: VS-A186539
CAS No: NA
Mol.F.: C9H5D6ClN2O2
Mol.Wt.: 220.68
Status: Custom Synthesis
Metoxuron-monomethyl-D3
CAT No: VS-A186546
CAS No: NA
Mol.F.: C9H8D3ClN2O2
Mol.Wt.: 217.67
Status: Custom Synthesis
Metoxuron-D6
CAT No: VS-A186547
CAS No: 2030182-41-1
Mol.F.: C10H7D6ClN2O2
Mol.Wt.: 234.71
Status: Custom Synthesis
Monuron-d6
CAT No: VS-A186548
CAS No: 217488-65-8
Mol.F.: C9H5D6ClN2O
Mol.Wt.: 204.69
Status: Custom Synthesis
MCPP methyl ester-d3
CAT No: VS-A186557
CAS No: NA
Mol.F.: C11H10D3ClO3
Mol.Wt.: 231.69
Status: Custom Synthesis
Methyl Acifluorfen-D3
CAT No: VS-A186576
CAS No: NA
Mol.F.: C15H8D3ClF3NO4
Mol.Wt.: 364.72
Status: Custom Synthesis
Malathion-d6
CAT No: VS-A186585
CAS No: 1189877-72-2
Mol.F.: C10H13D6O6PS2
Mol.Wt.: 336.39
Status: Custom Synthesis
Methyl oleate-d3
CAT No: VS-A186589
CAS No: 20960-67-2
Mol.F.: C19H33D3O2
Mol.Wt.: 299.51
Status: Custom Synthesis
Monoethyl Phthalate-D4
CAT No: VS-A186590
CAS No: 1219806-03-7
Mol.F.: C10H6D4O4
Mol.Wt.: 198.21
Status: Custom Synthesis
Monobutyl Phthalate-d4
CAT No: VS-A186596
CAS No: 478954-81-3
Mol.F.: C12H10D4O4
Mol.Wt.: 226.26
Status: Custom Synthesis
Metaproterenol-D7 Hemisulfate Salt
CAT No: VS-A186630
CAS No: 1346601-49-7
Mol.F.: C11H10D7NO3.1/2H2SO4
Mol.Wt.: 267.34
Status: Custom Synthesis
Mabuterol-D9
CAT No: VS-A186631
CAS No: 1246819-58-8
Mol.F.: C13H9D9ClF3N2O
Mol.Wt.: 319.8
Status: Custom Synthesis
Mapenterol-d6 Hydrochloride
CAT No: VS-A186632
CAS No: 1246816-02-3
Mol.F.: C14H15D6Cl2F3N2O
Mol.Wt.: 367.27
Status: Custom Synthesis
Malachite Green-(methyl-d12)
CAT No: VS-A186645
CAS No: NA
Mol.F.: C23H13D12ClN2
Mol.Wt.: 376.99
Status: Custom Synthesis
Malachite Green-D5
CAT No: VS-A186648
CAS No: NA
Mol.F.: C23H20D5ClN2
Mol.Wt.: 369.95
Status: Custom Synthesis
Malachite green D5 picrate
CAT No: VS-A186651
CAS No: 1258668-21-1
Mol.F.: C29D5H22N5O7
Mol.Wt.: 562.58
Status: Custom Synthesis
Norfloxacin-d5
CAT No: VS-A186654
CAS No: 1015856-57-1
Mol.F.: C16H13D5FN3O3
Mol.Wt.: 324.36
Status: Custom Synthesis
Lomefloxacin-D5 hydrochloride
CAT No: VS-A186657
CAS No: NA
Mol.F.: C17H15D5ClF2N3O3
Mol.Wt.: 392.84
Status: Custom Synthesis
Nadifloxacin-D9
CAT No: VS-A186662
CAS No: 2714421-20-0
Mol.F.: C19H12D9FN2O4
Mol.Wt.: 369.43
Status: Custom Synthesis
Ofloxacin D3
CAT No: VS-A186668
CAS No: 1173147-91-5
Mol.F.: C18H17D3FN3O4
Mol.Wt.: 364.4
Status: Custom Synthesis
Metronidazole-D3
CAT No: VS-A186675
CAS No: 83413-09-6
Mol.F.: C6H6D3N3O3
Mol.Wt.: 174.17
Status: Custom Synthesis
Nimesulide D5
CAT No: VS-A186678
CAS No: 1330180-22-7
Mol.F.: C13H7D5N2O5S
Mol.Wt.: 313.3
Status: Custom Synthesis
Mebendazole D3
CAT No: VS-A186692
CAS No: 1173021-87-8
Mol.F.: C16H10D3N3O3
Mol.Wt.: 298.3
Status: Custom Synthesis
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