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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.
Rac Ketoprofen-D3
CAT No: VS-A186070
CAS No: 159490-55-8
Mol.F.: C16H11D3O3
Mol.Wt.: 257.3
Status: In Stock
Oseltamivir D5 Hydrochloride
CAT No: VS-A186098
CAS No: 2140263-19-8
Mol.F.: C16H23D5N2O4 : HCl
Mol.Wt.: 317.4 : 36.5
Status: In Stock
Osimertinib D6
CAT No: VS-A186099
CAS No: 1638281-44-3
Mol.F.: C28H27D6N7O2
Mol.Wt.: 505.7
Status: In Stock
Palbociclib-d8
CAT No: VS-A186101
CAS No: 1628752-83-9
Mol.F.: C24H21D8N7O2
Mol.Wt.: 455.6
Status: In Stock
rac trans-Paroxetine-d4 Hydrochloride
CAT No: VS-A186102
CAS No: 1217753-24-6
Mol.F.: C19H17D4ClFNO3 : HCl
Mol.Wt.: 369.9 : 36.5
Status: In Stock
Pazopanib-d3
CAT No: VS-A186103
CAS No: 1219591-97-5
Mol.F.: C21H20D3N7O2S
Mol.Wt.: 440.5
Status: In Stock
perospirone D8
CAT No: VS-A186104
CAS No: NA
Mol.F.: C23H23D8ClN4O2S
Mol.Wt.: 471.09
Status: In Stock
Phenytoin-d10
CAT No: VS-A186105
CAS No: 65854-97-9
Mol.F.: C15H2D10N2O2
Mol.Wt.: 262.3
Status: In Stock
Pitolisant-D10
CAT No: VS-A186106
CAS No: 2416991-74-5
Mol.F.: C17H16D10ClNO
Mol.Wt.: 305.91
Status: In Stock
Pirfenidone-D3
CAT No: VS-A186107
CAS No: 1093951-85-9
Mol.F.: C12H8D3NO
Mol.Wt.: 188.24
Status: In Stock
Prazosin D8
CAT No: VS-A186109
CAS No: 1006717-55-0
Mol.F.: C19H13D8N5O4
Mol.Wt.: 391.5
Status: In Stock
Propiomazine-D6
CAT No: VS-A186111
CAS No: 2714474-32-3
Mol.F.: C20H18D6N2OS
Mol.Wt.: 382.98
Status: In Stock
Promethazine D6
CAT No: VS-A186112
CAS No: 1190043-26-5
Mol.F.: C17H14D6N2S
Mol.Wt.: 290.5
Status: In Stock
Propafenone-d5 Hydrochloride
CAT No: VS-A186113
CAS No: 1346605-05-7
Mol.F.: C21H23D5ClNO3
Mol.Wt.: 382.94
Status: In Stock
Propranolol -D7 hydrochloride
CAT No: VS-A186114
CAS No: NA
Mol.F.: C16H15D7ClNO2
Mol.Wt.: 302.85
Status: In Stock
Raloxifene-d4
CAT No: VS-A186115
CAS No: 1185076-44-1
Mol.F.: C28H23D4NO4S
Mol.Wt.: 477.61
Status: In Stock
Ranolazine-d3
CAT No: VS-A186116
CAS No: 1054624-77-9
Mol.F.: C24H30D3N3O4
Mol.Wt.: 430.56
Status: In Stock
Ranolazine-D8
CAT No: VS-A186117
CAS No: 1092804-88-0
Mol.F.: C24H25D8N3O4
Mol.Wt.: 435.59
Status: In Stock
Resiquimod-d5
CAT No: VS-A186118
CAS No: 2252319-44-9
Mol.F.: C17H17D5N4O2
Mol.Wt.: 319.41
Status: In Stock
Ritonavir-d6
CAT No: VS-A186119
CAS No: 1217720-20-1
Mol.F.: C37H42D6N6O5S2
Mol.Wt.: 726.98
Status: In Stock
Ribociclib-D8
CAT No: VS-A186120
CAS No: 2167898-24-8
Mol.F.: C23H22D8N8O
Mol.Wt.: 442.6
Status: In Stock
Rivastigmine-D6
CAT No: VS-A186121
CAS No: 194929-99-2
Mol.F.: C14H16D6N2O2
Mol.Wt.: 256.4
Status: In Stock
Ruxolitinib D9
CAT No: VS-A186123
CAS No: 1513883-55-0
Mol.F.: C17H9D9N6
Mol.Wt.: 315.4
Status: In Stock
Sacubitril D4
CAT No: VS-A186124
CAS No: 1884269-07-1
Mol.F.: C24H25D4NO5
Mol.Wt.: 415.5
Status: In Stock
Salmeterol D3
CAT No: VS-A186125
CAS No: 497063-94-2
Mol.F.: C25H34D3NO4
Mol.Wt.: 418.6
Status: In Stock
Selexipag D6
CAT No: VS-A186131
CAS No: 1265295-92-8
Mol.F.: C26H26D6N4O4S
Mol.Wt.: 502.7
Status: In Stock
Sildenafil-D3
CAT No: VS-A186132
CAS No: 1126745-90-1
Mol.F.: C22H27D3N6O4S
Mol.Wt.: 477.6
Status: In Stock
Sildenafil D8
CAT No: VS-A186133
CAS No: 951385-68-5
Mol.F.: C22H22D8N6O4S
Mol.Wt.: 482.6
Status: In Stock
Silodosin D4
CAT No: VS-A186134
CAS No: 1426173-86-5
Mol.F.: C25H28D4F3N3O4
Mol.Wt.: 499.6
Status: In Stock
Sofosbuvir D6
CAT No: VS-A186135
CAS No: 1868135-06-1
Mol.F.: C22H23D6FN3O9P
Mol.Wt.: 535.5
Status: In Stock
Sumatriptan D6
CAT No: VS-A186136
CAS No: 1020764-38-8
Mol.F.: C14H15D6N3O2S
Mol.Wt.: 301.4
Status: In Stock
Tadalafil D3
CAT No: VS-A186137
CAS No: 960226-55-5
Mol.F.: C22H16D3N3O4
Mol.Wt.: 392.4
Status: In Stock
Tamsulosin D4
CAT No: VS-A186138
CAS No: 1231943-97-7
Mol.F.: C20H24D4N2O5S
Mol.Wt.: 412.5
Status: In Stock
Tasimelteon D5
CAT No: VS-A186139
CAS No: 1962124-51-1
Mol.F.: C15H14D5NO2
Mol.Wt.: 250.4
Status: In Stock
Tamatinib D9
CAT No: VS-A186140
CAS No: 1260832-48-1
Mol.F.: C22H14D9FN6O5
Mol.Wt.: 479.52
Status: In Stock
Tenofovir Alafenamide-d5
CAT No: VS-A186141
CAS No: 1948248-01-8
Mol.F.: C21H24D5N6O5P
Mol.Wt.: 481.5
Status: In Stock
Tiagabine -D5. HCl
CAT No: VS-A186144
CAS No: 109857-73-0
Mol.F.: C20H21D5ClNO2S2
Mol.Wt.: 417.03
Status: In Stock
Timolol-D9 Maleate
CAT No: VS-A186145
CAS No: NA
Mol.F.: C17H19D9N4O7S
Mol.Wt.: 441.55
Status: In Stock
Quetiapine D4
CAT No: VS-A186162
CAS No: 1217311-36-8
Mol.F.: C21H21D4N3O2S
Mol.Wt.: 387.53
Status: In Stock
Rilpivirine d6
CAT No: VS-A186165
CAS No: 1312424-26-2
Mol.F.: C22H12D6N6
Mol.Wt.: 372.46
Status: In Stock
Risperidone D6
CAT No: VS-A186166
CAS No: 1225444-65-4
Mol.F.: C23H21D6FN4O2
Mol.Wt.: 416.5
Status: In Stock
Simvastatin D6
CAT No: VS-A186169
CAS No: 1002347-71-8
Mol.F.: C25H32D6O5
Mol.Wt.: 424.6
Status: In Stock
Simvastatin-d6 Hydroxy Acid Ammonium Salt
CAT No: VS-A186170
CAS No: NA
Mol.F.: C25H37D6NO6
Mol.Wt.: 459.65
Status: In Stock
Pantoprazole D6
CAT No: VS-A186174
CAS No: 922727-65-9
Mol.F.: C16H9D6F2N3O4S
Mol.Wt.: 389.4
Status: In Stock
Rosuvastatin D6
CAT No: VS-A186179
CAS No: 2070009-40-2
Mol.F.: C22H22D6FN3O6S
Mol.Wt.: 487.6
Status: In Stock
S-Adenosyl-L-methionine D3
CAT No: VS-A186186
CAS No: 68684-40-2
Mol.F.: C15H19D3N6O5S
Mol.Wt.: 401.46
Status: Custom Synthesis
Rebamipide-d4
CAT No: VS-A186190
CAS No: 1219409-06-9
Mol.F.: C19H11D4ClN2O4
Mol.Wt.: 374.81
Status: In Stock
Terbinafine D3 Hydrochloride
CAT No: VS-A186195
CAS No: 1310012-15-7
Mol.F.: C21H23D3ClN
Mol.Wt.: 330.91
Status: Custom Synthesis
Terbinafine EP Impurity A D3 Hydrochloride
CAT No: VS-A186196
CAS No: NA
Mol.F.: C12H10D3N : HCl
Mol.Wt.: 174.26 : 36.5
Status: Custom Synthesis
Rivaroxaban-D4
CAT No: VS-A186199
CAS No: 1132681-38-9
Mol.F.: C19H14D4ClN3O5S
Mol.Wt.: 439.9
Status: Custom Synthesis
Racemic Mirabegron D5
CAT No: VS-A186201
CAS No: 1215807-38-7
Mol.F.: C21H19D5N4O2S
Mol.Wt.: 401.5
Status: Custom Synthesis
Siponimod-D11
CAT No: VS-A186207
CAS No: 2104759-32-0
Mol.F.: C29H24D11F3N2O3
Mol.Wt.: 527.67
Status: Custom Synthesis
Rapamycin D3
CAT No: VS-A186208
CAS No: 392711-19-2
Mol.F.: C51H76D3NO13
Mol.Wt.: 917.2
Status: Custom Synthesis
Sonidegib Hydrazo Impurity-D8
CAT No: VS-A186213
CAS No: NA
Mol.F.: C37H33D8F3N6O4
Mol.Wt.: 698.8
Status: Custom Synthesis
Sonidegib-D4
CAT No: VS-A186214
CAS No: NA
Mol.F.: C26H22D4F3N3O3
Mol.Wt.: 489.52
Status: Custom Synthesis
Pomalidomide D4
CAT No: VS-A186232
CAS No: 1416575-78-4
Mol.F.: C13H7D4N3O4
Mol.Wt.: 277.3
Status: Custom Synthesis
rac-Threo-Dihydro Bupropion D9 HCl
CAT No: VS-A186233
CAS No: 1392209-60-7
Mol.F.: C13H11D9ClNO : HCl
Mol.Wt.: 250.8 : 36.5
Status: Custom Synthesis
Thioctic Acid D5
CAT No: VS-A186234
CAS No: 1189471-66-6
Mol.F.: C8H9D5O2S2
Mol.Wt.: 211.3
Status: Custom Synthesis
Tenofovir D6
CAT No: VS-A186235
CAS No: 1020719-94-1
Mol.F.: C9H8D6N5O4P
Mol.Wt.: 293.3
Status: Custom Synthesis
Tigecycline D9
CAT No: VS-A186236
CAS No: NA
Mol.F.: C29H30D9N5O8
Mol.Wt.: 594.7
Status: Custom Synthesis
rac-Erythro-Dihydro Bupropion D9 HCl
CAT No: VS-A186240
CAS No: 2517771-79-6
Mol.F.: C13H11D9ClNO : HCl
Mol.Wt.: 250.8 : 36.5
Status: Custom Synthesis
rac-trans-Ambroxol-D5
CAT No: VS-A186259
CAS No: 1246818-80-3
Mol.F.: C13H13D5Br2N2O
Mol.Wt.: 383.13
Status: Custom Synthesis
rac-trans-Ambroxol-D5 Hydrochloride
CAT No: VS-A186260
CAS No: NA
Mol.F.: C13H13D5Br2N2O : HCl
Mol.Wt.: 383.13 : 36.5
Status: Custom Synthesis
rac Cinacalcet-d3 Hydrochloride
CAT No: VS-A186266
CAS No: 1185097-33-9
Mol.F.: C22H20D3ClF3N
Mol.Wt.: 396.89
Status: Custom Synthesis
R-(+)-Warfarin-d5
CAT No: VS-A186268
CAS No: 773005-79-1
Mol.F.: C19H11D5O4
Mol.Wt.: 313.36
Status: Custom Synthesis
S-(-)-Warfarin-d5
CAT No: VS-A186269
CAS No: 791013-22-4
Mol.F.: C19H11D5O4
Mol.Wt.: 313.36
Status: Custom Synthesis
Taurochenodeoxycholic Acid-D4 Sodium
CAT No: VS-A186270
CAS No: 2410279-85-3
Mol.F.: C26H40D4NNaO6S
Mol.Wt.: 525.71
Status: Custom Synthesis
Taurodeoxycholic Acid-D4 Sodium
CAT No: VS-A186271
CAS No: 2410279-82-0
Mol.F.: C26H40D4NNaO6S
Mol.Wt.: 525.71
Status: Custom Synthesis
Rac-Omeprazole-D3
CAT No: VS-A186282
CAS No: 922731-01-9
Mol.F.: C17H16D3N3O3S
Mol.Wt.: 348.4
Status: Custom Synthesis
Spironolactone D3
CAT No: VS-A186283
CAS No: NA
Mol.F.: C24H29D3O4S
Mol.Wt.: 419.6
Status: Custom Synthesis
Sumatriptan-d6 Succinate
CAT No: VS-A186284
CAS No: 1215621-31-0
Mol.F.: C18H21D6N3O6S
Mol.Wt.: 419.53
Status: Custom Synthesis
Promethazine D6 Hydrochloride
CAT No: VS-A186301
CAS No: 1189947-02-1
Mol.F.: C17H14D6N2S : HCl
Mol.Wt.: 290.5 : 36.5
Status: Custom Synthesis
Ranolazine-D8 Dihydrochloride
CAT No: VS-A186319
CAS No: 1219802-60-4
Mol.F.: C24H25D8N3O4 : 2(HCl)
Mol.Wt.: 435.6 : 2(36.5)
Status: Custom Synthesis
Prasugrel-D4 Metabolite
CAT No: VS-A186337
CAS No: 2673269-91-3
Mol.F.: C18H14D4FNO2S
Mol.Wt.: 335.4
Status: Custom Synthesis
Tizanidine-D4
CAT No: VS-A186338
CAS No: 1188331-19-2
Mol.F.: C9H4D4ClN5S
Mol.Wt.: 257.7
Status: Custom Synthesis
Praziquantel D11
CAT No: VS-A186346
CAS No: 1246343-36-1
Mol.F.: C19H13D11N2O2
Mol.Wt.: 323.5
Status: Custom Synthesis
rac-Duloxetine-D3 Oxalate
CAT No: VS-A186348
CAS No: 11617-14-2
Mol.F.: C20H18D3NO5S
Mol.Wt.: 390.47
Status: Custom Synthesis
Ranolazine-D8 Intermediate
CAT No: VS-A186350
CAS No: NA
Mol.F.: C14H13D8N3O
Mol.Wt.: 255.39
Status: Custom Synthesis
Ranolazine-D8 Impurity
CAT No: VS-A186351
CAS No: NA
Mol.F.: C24H24D8N4O2
Mol.Wt.: 416.59
Status: Custom Synthesis
Ranitidine-d6 Hydrochloride
CAT No: VS-A186360
CAS No: 1185238-09-8
Mol.F.: C13H17D6ClN4O3S
Mol.Wt.: 356.9
Status: Custom Synthesis
S-(-)-Carbidopa-D3 (ring)
CAT No: VS-A186361
CAS No: NA
Mol.F.: C10H11D3N2O4
Mol.Wt.: 229.25
Status: Custom Synthesis
Sitagliptin-D4 Hydrochloride
CAT No: VS-A186362
CAS No: NA
Mol.F.: C16H11D4F6N5O : HCl
Mol.Wt.: 411.3 : 36.5
Status: Custom Synthesis
Tauroursodeoxycholic Acid-D4 Sodium
CAT No: VS-A186363
CAS No: 2410279-95-5
Mol.F.: C26H40D4NNaO6S
Mol.Wt.: 525.71
Status: Custom Synthesis
Tiotropium D3 Bromide
CAT No: VS-A186364
CAS No: 1127226-56-5
Mol.F.: C19H19D3NO4S2 : Br
Mol.Wt.: 395.5 : 79.9
Status: Custom Synthesis
rac-Clopidogrel-D3 Bisulfate
CAT No: VS-A186372
CAS No: NA
Mol.F.: C16H15D3ClNO6S2
Mol.Wt.: 422.92
Status: Custom Synthesis
Oxybutynin D11 Hydrochloride
CAT No: VS-A186374
CAS No: 1185151-95-4
Mol.F.: C22H20D11NO3 : HCl
Mol.Wt.: 368.6 : 36.5
Status: Custom Synthesis
Ranitidine D6
CAT No: VS-A186375
CAS No: 1185514-83-3
Mol.F.: C13H16D6N4O3S
Mol.Wt.: 320.4
Status: Custom Synthesis
Phenyl-D5-Boronic Acid
CAT No: VS-A186400
CAS No: 215527-70-1
Mol.F.: C6H2D5BO2
Mol.Wt.: 126.96
Status: Custom Synthesis
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