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Impurity Reference Standards

Pharmacopoeial impurities, nitrosamines, metabolites, labelled internal standards and API working standards, each backed by analytical data for method development and QC.

20,060 products6 categories2,050 in stockCOA + SDS with every lot

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Sulfadiazine-13C6

CAS: 1189426-16-1
Formula: C₁₀H₁₀N₄O₂S
MW: 256.24 g/mol

ZX-043189

Sulfadiazine-d4

CAS: 1020719-78-1
Formula: C₁₀H₁₀N₄O₂S
MW: 254.3 g/mol

ZX-032581

Sulfadimethoxine

CAS: 122-11-2
Formula: C₁₂H₁₄N₄O₄S
MW: 310.33 g/mol

ZX-027039

Sulfadimethoxine EP Impurity A

CAS: 3289-50-7
Formula: C₆H₉N₃O₂
MW: 155.15 g/mol

ZX-032919

Sulfadimethoxine Sodium

CAS: 1037-50-9
Formula: C₁₂H₁₃N₄NaO₄S
MW: 332.31 g/mol

ZX-036219

Sulfadimethoxine-d6

CAS: 73068-02-7
Formula: C₁₂H₁₄N₄O₄S
MW: 316.37 g/mol

ZX-036221

Sulfadimidine Sodium

CAS: 1981-58-4
Formula: C₁₂H₁₃N₄NaO₂S
MW: 300.31 g/mol

ZX-036222

Sulfaguanidine EP Impurity B

CAS: 547-44-4
Formula: C₇H₉N₃O₃S
MW: 215.23 g/mol

ZX-042980

Sulfameter

CAS: 651-06-9
Formula: C₁₁H₁₂N₄O₃S
MW: 280.31 g/mol

ZX-034873

Sulfamethizole

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

ZX-032584

Sulfamethizole-13C6

CAS: 1334378-92-5
Formula: C₉H₁₀N₄O₂S₂
MW: 276.3 g/mol

ZX-042525

Sulfamethoxazole EP Impurity A

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

ZX-027042

Sulfamethoxazole EP Impurity B

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

ZX-027041

Sulfamethoxazole EP Impurity F

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

ZX-022823

Sulfamethoxazole N4-glucoside (alpha/beta mixture)

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

ZX-027043

Sulfamethoxazole-13C6

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

ZX-036224

Sulfamethoxypyrazine

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

ZX-032583

Sulfamethoxypyridazine

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

ZX-032586

Sulfamethoxypyridazine-d3

CAS: 1172846-03-5
Formula: C₁₁H₁₂N₄O₃S
MW: 283.32 g/mol

ZX-044743

Sulfamonomethoxine

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

ZX-036220

Sulfamonomethoxine sodium

CAS: 38006-08-5
Formula: C₁₁H₁₁N₄NaO₃S
MW: 302.29 g/mol

ZX-046487

Sulfamoxole

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

ZX-036225

Sulfapyridine 13C6

CAS: 1228182-45-3
Formula: C₁₁H₁₁N₃O₂S
MW: 255.25 g/mol

ZX-042527

Sulfaquinoxaline

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

ZX-032587

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