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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.
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
Trandolaprilat-D5
CAT No: VS-A186146
CAS No: NA
Mol.F.: C22H25D5N2O5
Mol.Wt.: 407.52
Status: In Stock
Ulipristal Acetate-d3
CAT No: VS-A186147
CAS No: 1621894-62-9
Mol.F.: C30H34D3NO4
Mol.Wt.: 478.64
Status: In Stock
Valsartan D9
CAT No: VS-A186149
CAS No: 1089736-73-1
Mol.F.: C24H20D9N5O3
Mol.Wt.: 444.6
Status: In Stock
Velpatasvir-D3
CAT No: VS-A186150
CAS No: 2172676-06-9
Mol.F.: C49H51D3N8O8
Mol.Wt.: 886.04
Status: In Stock
Verapamil-d6
CAT No: VS-A186152
CAS No: 1185193-17-2
Mol.F.: C27D6H32N2O4
Mol.Wt.: 460.63
Status: In Stock
Vortioxetine-D8
CAT No: VS-A186154
CAS No: 2140316-62-5
Mol.F.: C18H14D8N2S
Mol.Wt.: 306.49
Status: In Stock
Viloxazine D5
CAT No: VS-A186155
CAS No: 117320-32-8
Mol.F.: C13H14D5NO3
Mol.Wt.: 242.3
Status: In Stock
Warfarin D5
CAT No: VS-A186156
CAS No: 75472-93-4
Mol.F.: C19H11D5O4
Mol.Wt.: 313.4
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
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
Siponimod-D11
CAT No: VS-A186207
CAS No: 2104759-32-0
Mol.F.: C29H24D11F3N2O3
Mol.Wt.: 527.67
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
Upadacitinib-d4
CAT No: VS-A186228
CAS No: NA
Mol.F.: C17H15D4F3N6O
Mol.Wt.: 384.39
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
Trimethoprim-D3
CAT No: VS-A186250
CAS No: 1189923-38-3
Mol.F.: C14H15D3N4O3
Mol.Wt.: 293.3
Status: Custom Synthesis
Trimethoprim-D4 (major)
CAT No: VS-A186251
CAS No: NA
Mol.F.: C15H4D4N2O2
Mol.Wt.: 252.26
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
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
Tizanidine-D4
CAT No: VS-A186338
CAS No: 1188331-19-2
Mol.F.: C9H4D4ClN5S
Mol.Wt.: 257.7
Status: Custom Synthesis
Tizanidine-D5 Hydrochloride
CAT No: VS-A186339
CAS No: 1188263-51-5
Mol.F.: C9H4D4ClN5S :HCl
Mol.Wt.: 257.7 : 36.5
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
Triamcinolone Acetonide D6
CAT No: VS-A186365
CAS No: 352431-33-5
Mol.F.: C24H25D6FO6
Mol.Wt.: 440.5
Status: Custom Synthesis
Verapamil-D7 Hydrochloride
CAT No: VS-A186370
CAS No: 1188265-55-5
Mol.F.: C27H32D7ClN2O4
Mol.Wt.: 498.11
Status: Custom Synthesis
Ursodeoxycholic Acid D4
CAT No: VS-A186382
CAS No: 347841-46-7
Mol.F.: C24H36D4O4
Mol.Wt.: 396.6
Status: Custom Synthesis
Sitagliptin Nitroso Impurity-D4
CAT No: VS-A186397
CAS No: NA
Mol.F.: C6H2D4F3N5O
Mol.Wt.: 225.2
Status: Custom Synthesis
Tert-Butanol-D9
CAT No: VS-A186446
CAS No: 25725-11-5
Mol.F.: C4HD9O
Mol.Wt.: 83.18
Status: Custom Synthesis
Veratric Acid D6
CAT No: VS-A186455
CAS No: 1162658-12-9
Mol.F.: C9H4D6O4
Mol.Wt.: 188.2
Status: Custom Synthesis
Vonoprazan Fumarate-D3
CAT No: VS-A186457
CAS No: NA
Mol.F.: C21H17D3FN3O6S
Mol.Wt.: 464.48
Status: Custom Synthesis
Veratraldehyde-D3
CAT No: VS-A186459
CAS No: 143318-06-3
Mol.F.: C9H7D3O3
Mol.Wt.: 169.19
Status: Custom Synthesis
Vanilloside-D3
CAT No: VS-A186480
CAS No: NA
Mol.F.: C14H15D3O8
Mol.Wt.: 317.31
Status: Custom Synthesis
Tert-Butyl-D9-Amine
CAT No: VS-A186505
CAS No: 6045-08-5
Mol.F.: C4H2D9N
Mol.Wt.: 82.19
Status: Custom Synthesis
Trimethyl Phosphate-d9
CAT No: VS-A186513
CAS No: 32176-12-8
Mol.F.: C3D9O4P
Mol.Wt.: 149.13
Status: Custom Synthesis
Urethane-d5
CAT No: VS-A186517
CAS No: 73962-07-9
Mol.F.: C3H2D5NO2
Mol.Wt.: 94.12
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
Vitavax-D5
CAT No: VS-A186567
CAS No: NA
Mol.F.: C12H8D5NO2S
Mol.Wt.: 240.33
Status: Custom Synthesis
Trifloxystrobin-d3
CAT No: VS-A186580
CAS No: NA
Mol.F.: C20H16D3F3N2O4
Mol.Wt.: 411.39
Status: Custom Synthesis
Tricaine-d5 methanesulfonate
CAT No: VS-A186582
CAS No: NA
Mol.F.: C10H10D5NO5S
Mol.Wt.: 266.33
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
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
Terbutaline D9
CAT No: VS-A186629
CAS No: 1189658-09-0
Mol.F.: C12H10D9NO3
Mol.Wt.: 234.3
Status: Custom Synthesis
Tilmicosin-D3
CAT No: VS-A186660
CAS No: 2714486-61-8
Mol.F.: C46H77D3N2O13
Mol.Wt.: 872.15
Status: Custom Synthesis
Thiabendazole-D4
CAT No: VS-A186685
CAS No: 1190007-20-5
Mol.F.: C10H3D4N3S
Mol.Wt.: 205.27
Status: Custom Synthesis
Triclabendazole D3
CAT No: VS-A186693
CAS No: 1353867-93-2
Mol.F.: C14H6D3Cl3N2OS
Mol.Wt.: 362.7
Status: Custom Synthesis
Thiamphenicol-methyl-D3
CAT No: VS-A186696
CAS No: NA
Mol.F.: C12H12D3Cl2NO5S
Mol.Wt.: 359.23
Status: Custom Synthesis
Semaglutide-d8 Tetratrifluoroacetate
CAT No: VS-A186703
CAS No: NA
Mol.F.: C187H283D8N45O59 : 4 (C2HF3O2)
Mol.Wt.: 4121.69 : 4(114.02)
Status: Custom Synthesis
Semaglutide-d15 Tetratrifluoroacetate
CAT No: VS-A186704
CAS No: NA
Mol.F.: C187H276D15N45O59 : 4 (C2HF3O2)
Mol.Wt.: 4128.73 : 4(114.02)
Status: Custom Synthesis
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