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Impurities & Reference Standards

Pharmacopoeial and non-pharmacopoeial impurities, metabolites, nitrosamines and working standards with characterisation data for QC and regulatory work.

27,990products

6sub-categories

2,746in stock

COA + SDSwith every lot

API Impurities 14,098 Pharmacopeial Impurities (EP / USP / BP) 4,399 Nitrosamine Impurities 631 Stable Isotope Labelled Standards (Deuterated, 13C, 15N) 1,504 Metabolites & Degradation Products 3,922 API Reference Standards 3,436

Reference Standard

Sulfamethizole chemical structure

CAS: 144-82-1
Formula: C₉H₁₀N₄O₂S₂
MW: 270.3 g/mol

VQ-033978

Reference Standard

Sulfamethoxazole EP Impurity A chemical structure

Sulfamethoxazole EP Impurity A

CAS: 21312-10-7
Formula: C₁₂H₁₃N₃O₄S
MW: 295.32 g/mol

VQ-028142

Reference Standard

Sulfamethoxazole EP Impurity B chemical structure

Sulfamethoxazole EP Impurity B

CAS: 135529-16-7
Formula: C₁₆H₁₆N₄O₅S₂
MW: 408.5 g/mol

VQ-028141

Reference Standard

Sulfamethoxazole EP Impurity F chemical structure

Sulfamethoxazole EP Impurity F

CAS: 17103-52-5
Formula: C₁₀H₁₁N₃O₃S
MW: 253.28 g/mol

VQ-023807

Reference Standard

Sulfamethoxazole N4-glucoside (alpha/beta mixture) chemical structure

Sulfamethoxazole N4-glucoside (alpha/beta mixture)

CAS: 119691-75-7
Formula: C₁₆H₂₁N₃O₈S
MW: 415.4 g/mol

VQ-028143

Reference Standard

Sulfamethoxazole-13C6 chemical structure

Sulfamethoxazole-13C6

CAS: 1196157-90-0
Formula: C₁₀H₁₁N₃O₃S
MW: 259.24 g/mol

VQ-042306

Reference Standard

Sulfamethoxazole-d4 chemical structure

Sulfamethoxazole-d4

CAS: 1020719-86-1
Formula: C₁₀H₁₁N₃O₃S
MW: 257.3 g/mol

VQ-042305

Reference Standard

Sulfamethoxypyrazine chemical structure

Sulfamethoxypyrazine

CAS: 152-47-6
Formula: C₁₁H₁₂N₄O₃S
MW: 280.31 g/mol

VQ-033977

Reference Standard

Sulfamethoxypyridazine chemical structure

Sulfamethoxypyridazine

CAS: 80-35-3
Formula: C₁₁H₁₂N₄O₃S
MW: 280.31 g/mol

VQ-033980

Reference Standard

Sulfametomidine chemical structure

Sulfametomidine

CAS: 3772-76-7
Formula: C₁₂H₁₄N₄O₃S
MW: 294.33 g/mol

VQ-033974

Reference Standard

Sulfamonomethoxine chemical structure

Sulfamonomethoxine

CAS: 1220-83-3
Formula: C₁₁H₁₂N₄O₃S
MW: 280.31 g/mol

VQ-042295

Reference Standard

Sulfamoxole chemical structure

CAS: 729-99-7
Formula: C₁₁H₁₃N₃O₃S
MW: 267.31 g/mol

VQ-042307

Reference Standard

Sulfaphenazole chemical structure

CAS: 526-08-9
Formula: C₁₅H₁₄N₄O₂S
MW: 314.4 g/mol

VQ-033981

Reference Standard

Sulfapyridine-d4 chemical structure

Sulfapyridine-d4

CAS: 1189863-86-2
Formula: C₁₁H₁₁N₃O₂S
MW: 253.32 g/mol

VQ-042308

Reference Standard

Sulfaquinoxaline chemical structure

Sulfaquinoxaline

CAS: 59-40-5
Formula: C₁₄H₁₂N₄O₂S
MW: 300.34 g/mol

VQ-033982

Reference Standard

Sulfaquinoxaline sodium chemical structure

Sulfaquinoxaline sodium

CAS: 967-80-6
Formula: C₁₄H₁₁N₄NaO₂S
MW: 322.32 g/mol

VQ-042309

Reference Standard

Sulfasalazine chemical structure

CAS: 599-79-1
Formula: C₁₈H₁₄N₄O₅S
MW: 398.4 g/mol

VQ-023808

Reference Standard

Sulfasalazine EP Impurity A chemical structure

Sulfasalazine EP Impurity A

CAS: 1391062-35-3
Formula: C₂₈H₂₂N₈O₅S₂
MW: 614.7 g/mol

VQ-023815

Reference Standard

Sulfasalazine EP Impurity B chemical structure

Sulfasalazine EP Impurity B

CAS: 1391062-49-9
Formula: C₂₉H₂₂N₈O₇S₂
MW: 658.7 g/mol

VQ-023814

Reference Standard

Sulfasalazine EP Impurity C chemical structure

Sulfasalazine EP Impurity C

CAS: 66030-25-9
Formula: C₁₈H₁₄N₄O₃
MW: 334.3 g/mol

VQ-023810

Reference Standard

Sulfasalazine EP Impurity D chemical structure

Sulfasalazine EP Impurity D

CAS: 66364-70-3
Formula: C₁₇H₁₄N₄O₃S
MW: 354.4 g/mol

VQ-023813

Reference Standard

Sulfasalazine EP Impurity E chemical structure

Sulfasalazine EP Impurity E

CAS: 1391062-34-2
Formula: C₂₉H₂₂N₆O₇S₂
MW: 630.7 g/mol

VQ-023812

Reference Standard

Sulfasalazine EP Impurity F chemical structure

Sulfasalazine EP Impurity F

CAS: 66364-71-4
Formula: C₁₈H₁₄N₄O₅S
MW: 398.4 g/mol

VQ-023809

Reference Standard

Sulfasalazine EP Impurity G chemical structure

Sulfasalazine EP Impurity G

CAS: 1391062-37-5
Formula: C₂₉H₂₂N₆O₇S₂
MW: 630.7 g/mol

VQ-028146

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