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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
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
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
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
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
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
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
Tenofovir D6
CAT No: VS-A186235
CAS No: 1020719-94-1
Mol.F.: C9H8D6N5O4P
Mol.Wt.: 293.3
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
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
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
rac-Clopidogrel-D3 Bisulfate
CAT No: VS-A186372
CAS No: NA
Mol.F.: C16H15D3ClNO6S2
Mol.Wt.: 422.92
Status: Custom Synthesis
Ranitidine D6
CAT No: VS-A186375
CAS No: 1185514-83-3
Mol.F.: C13H16D6N4O3S
Mol.Wt.: 320.4
Status: Custom Synthesis
Pyridostigmine-d6 bromide
CAT No: VS-A186451
CAS No: 2375858-08-3
Mol.F.: C9H7D6N2O2 : Br
Mol.Wt.: 187.3 : 79.9
Status: Custom Synthesis
rac-Propanolol D7
CAT No: VS-A186464
CAS No: 344298-99-3
Mol.F.: C16H14D7NO2
Mol.Wt.: 266.4
Status: Custom Synthesis
Rac 1-Palmitoyl-3-chloropropanediol-d5
CAT No: VS-A186489
CAS No: 1346599-60-7
Mol.F.: C19H32D5ClO3
Mol.Wt.: 353.98
Status: Custom Synthesis
Sudan I-d5
CAT No: VS-A186566
CAS No: 752211-63-5
Mol.F.: C16H7D5N2O
Mol.Wt.: 253.31
Status: Custom Synthesis
Pyrimethanil-d5
CAT No: VS-A186569
CAS No: 2118244-83-8
Mol.F.: C12H8D5N3
Mol.Wt.: 204.29
Status: Custom Synthesis
Sulfadiazine-D4
CAT No: VS-A186597
CAS No: 1020719-78-1
Mol.F.: C10H6D4N4O2S
Mol.Wt.: 254.3
Status: Custom Synthesis
Sulfamethizole-D4
CAT No: VS-A186598
CAS No: NA
Mol.F.: C9H6D4N4O2S2
Mol.Wt.: 274.36
Status: Custom Synthesis
Sulfapyridine-d4
CAT No: VS-A186599
CAS No: 1189863-86-2
Mol.F.: C11H7D4N3O2S
Mol.Wt.: 253.3
Status: Custom Synthesis
Sulfamethoxypyridazine-D4
CAT No: VS-A186600
CAS No: NA
Mol.F.: C11H8D4N4O3S
Mol.Wt.: 284.33
Status: Custom Synthesis
Sulfamethoxypyridazine-D3
CAT No: VS-A186601
CAS No: 1172846-03-5
Mol.F.: C11H9D3N4O3S
Mol.Wt.: 283.32
Status: Custom Synthesis
Sulfamethoxazole-D4
CAT No: VS-A186602
CAS No: 1020719-86-1
Mol.F.: C10H7D4N3O3S
Mol.Wt.: 257.3
Status: Custom Synthesis
Sulfabenzamide-D4
CAT No: VS-A186603
CAS No: 2732981-22-3
Mol.F.: C13H8D4N2O3S
Mol.Wt.: 280.34
Status: Custom Synthesis
Sulfaguanidine-D4
CAT No: VS-A186604
CAS No: NA
Mol.F.: C7H6D4N4O2S
Mol.Wt.: 218.27
Status: Custom Synthesis
Sulfacetamide-D4
CAT No: VS-A186605
CAS No: NA
Mol.F.: C8H6D4N2O3S
Mol.Wt.: 218.27
Status: Custom Synthesis
Sulfathiazole-D4
CAT No: VS-A186606
CAS No: 1020719-89-4
Mol.F.: C9H5D4N3O2S2
Mol.Wt.: 259.34
Status: Custom Synthesis
Sulfamerazine-D4
CAT No: VS-A186607
CAS No: 1020719-84-9
Mol.F.: C11H8D4N4O2S
Mol.Wt.: 268.33
Status: Custom Synthesis
Sulfamocol-D4
CAT No: VS-A186608
CAS No: NA
Mol.F.: C11H9D4N3O3S
Mol.Wt.: 271.33
Status: Custom Synthesis
Sulfameter-D4
CAT No: VS-A186609
CAS No: 1189483-96-2
Mol.F.: C11H8D4N4O3S
Mol.Wt.: 284.33
Status: Custom Synthesis
Sulfamethazine-D4
CAT No: VS-A186610
CAS No: 1020719-82-7
Mol.F.: C12H10D4N4O2S
Mol.Wt.: 282.36
Status: Custom Synthesis
Saroglitazar D4 Magnesium Salt
CAT No: VS-A186611
CAS No: NA
Mol.F.: 2(C25H24D4NO4S).Mg
Mol.Wt.: 909.48
Status: Custom Synthesis
Sulfachlorpyridazine-D4
CAT No: VS-A186612
CAS No: 1795037-54-5
Mol.F.: C10H5D4ClN4O2S
Mol.Wt.: 288.75
Status: Custom Synthesis
Sulfamonomethoxine-D4
CAT No: VS-A186613
CAS No: 1286538-12-2
Mol.F.: C11H8D4N4O3S
Mol.Wt.: 284.33
Status: Custom Synthesis
Sulfamonomethoxine-D3
CAT No: VS-A186614
CAS No: 2704162-84-3
Mol.F.: C11H9D3N4O3S
Mol.Wt.: 283.32
Status: Custom Synthesis
Sulfisoxazole-D4
CAT No: VS-A186615
CAS No: 1388717-81-4
Mol.F.: C11H13N3O3S
Mol.Wt.: 267.3
Status: Custom Synthesis
Sulfadoxine-D4
CAT No: VS-A186616
CAS No: 1330266-05-1
Mol.F.: C12H10D4N4O4S
Mol.Wt.: 314.35
Status: Custom Synthesis
Sulfaphenazole-D4
CAT No: VS-A186617
CAS No: NA
Mol.F.: C15H10D4N4O2S
Mol.Wt.: 318.39
Status: Custom Synthesis
Sulfamethoxazole D4
CAT No: VS-A186618
CAS No: 1020719-80-5
Mol.F.: C12H10D4N4O4S
Mol.Wt.: 314.4
Status: Custom Synthesis
Sulfamethoxazole D6
CAT No: VS-A186619
CAS No: 73068-02-7
Mol.F.: C12H8D6N4O4S
Mol.Wt.: 316.4
Status: Custom Synthesis
Sulfadoxine D3
CAT No: VS-A186620
CAS No: 1262770-70-6
Mol.F.: C12H11D3N4O4S
Mol.Wt.: 313.35
Status: Custom Synthesis
Sulfaquinoxaline-D4
CAT No: VS-A186621
CAS No: 1329652-02-9
Mol.F.: C14H8D4N4O2S
Mol.Wt.: 304.36
Status: Custom Synthesis
Ractopamine D3 hydrochloride
CAT No: VS-A186638
CAS No: 1219794-72-5
Mol.F.: C18H20D3NO3 : HCl
Mol.Wt.: 304.40 : 36.46
Status: Custom Synthesis
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