Impurity Reference Standards

API Impurities

Process impurities, isomers, degradants and related compounds for thousands of APIs, characterised for method development, validation and QC release.

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Diethyl-2-propylimidazole-4,5-dicarboxylate

CAS: 144689-94-1
Formula: C₁₂H₁₈N₂O₄
MW: 254.28 g/mol

ZX-025913

Diethylamine salicylate

CAS: 4419-92-5
Formula: C₁₁H₁₇NO₃
MW: 211.26 g/mol

ZX-036154

Diethylene Glycol Bisphthalate

CAS: 13988-26-6
Formula: C₁₂H₁₂O₅
MW: 236.22 g/mol

ZX-031076

Diethylene Glycol Di(p-toluenesulfonate)

CAS: 7460-82-4
Formula: C₁₈H₂₂O₇S₂
MW: 414.5 g/mol

ZX-033604

Diethylglycine

CAS: 1606-01-5
Formula: C₆H₁₃NO₂
MW: 131.17 g/mol

ZX-035839

Diethylstilbestrol Dimethyl ether

CAS: 7773-34-4
Formula: C₂₀H₂₄O₂
MW: 296.4 g/mol

ZX-024277

Diethylstilbestrol Monomethyl Ether

CAS: 7773-60-6
Formula: C₁₉H₂₂O₂
MW: 282.4 g/mol

ZX-024278

Diethyltoluamide Related Compound A (N,N-Diethyl-4-toluamide) (1197018)

CAS: 2728-05-4
Formula: C₁₂H₁₇NO
MW: 191.27 g/mol

ZX-033310

Diflorasone

CAS: 2557-49-5
Formula: C₂₂H₂₈F₂O₅
MW: 410.5 g/mol

ZX-024279

Diflorasone 17-Propionate

CAS: 924726-89-6
Formula: C₂₅H₃₂F₂O₆
MW: 466.5 g/mol

ZX-024990

Diflorasone 17-propionate-21-mesylate

CAS: 84509-92-2
Formula: C₂₆H₃₄F₂O₈S
MW: 544.6 g/mol

ZX-024280

Diflorasone 21-acetate

CAS: 3826-17-3
Formula: C₂₄H₃₀F₂O₆
MW: 452.5 g/mol

ZX-028990

Diflorasone 21-propionate

CAS: 541502-98-1
Formula: C₁₈H₂₃BrO₂
MW: 354.3 g/mol

ZX-024281

Diflucortolone 17-Carboxylic Acid

CAS: 1369516-34-6
Formula: C₂₁H₂₆F₂O₄
MW: 380.4 g/mol

ZX-028993

Diflucortolone 21-Valerate

CAS: 59198-70-8
Formula: C₂₇H₃₆F₂O₅
MW: 478.6 g/mol

ZX-029564

Diflucortolone Valerate 9,11-Epoxide

CAS: 65535-29-7
Formula: C₂₇H₃₅FO₅
MW: 458.6 g/mol

ZX-033311

Diflunisal Impurity 9

CAS: 2285-29-2
Formula: C₁₂H₈F₂
MW: 190.19 g/mol

ZX-004623

Difluocortolone 21-Acetate

CAS: 2541-37-9
Formula: C₂₄H₃₀F₂O₅
MW: 436.5 g/mol

ZX-028991

Difluoro Atorvastatin Acetonide tert-Butyl Ester

CAS: 693793-87-2
Formula: C₄₀H₄₆F₂N₂O₅
MW: 672.8 g/mol

ZX-028110

Difluoroprednisolone-17, 21-Diacetate

CAS: 23641-05-6
Formula: C₂₅H₃₀F₂O₇
MW: 480.5 g/mol

ZX-026509

Digitoxin

CAS: 71-63-6
Formula: C₄₁H₆₄O₁₃
MW: 764.9 g/mol

ZX-024282

Digoxin - Impurity J

CAS: 5355-48-6
Formula: C₄₃H₆₆O₁₅
MW: 823 g/mol

ZX-024287

Dihydro Artemisinic Acid

CAS: 85031-59-0
Formula: C₁₅H₂₄O₂
MW: 236.35 g/mol

ZX-023369

Dihydro Artemisinin Dimer

CAS: 150358-71-7
Formula: C₃₀H₄₆O₉
MW: 550.7 g/mol

ZX-019893

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