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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Vonoprazan Impurity 28

CAS: 56448-22-7
Formula: C₁₁H₉NO
MW: 171.19 g/mol

ZX-027623

Vonoprazan Impurity 283 (Intermediate Stage I)

CAS: 928324-73-6
Formula: C₁₆H₁₁FN₂O₃S
MW: 330.3 g/mol

ZX-005532

Vonoprazan Sulfonyl Aldehyde Impurity

CAS: 881677-11-8
Formula: C₁₆H₁₁FN₂O₃S
MW: 330.3 g/mol

ZX-023037

Voriconazole (2R,3R)-Isomer

CAS: 137234-76-5
Formula: C₁₆H₁₄Cl₂F₃N₅O
MW: 420.2 g/mol

ZX-005533

Voriconazole Dibromo Impurity-5

CAS: 908352-44-3
Formula: C₆H₄Br₂ClFN₂
MW: 318.37 g/mol

ZX-005534

Voriconazole Impurity-5

CAS: 137234-74-3
Formula: C₆H₆ClFN₂
MW: 160.58 g/mol

ZX-005535

Vortioxetine Sulfone

CAS: 1639263-80-1
Formula: C₁₈H₂₂N₂O₂S
MW: 330.4 g/mol

ZX-027632

Voxelotor Impurity 1

CAS: 1282518-60-8
Formula: C₁₂H₂₁BN₂O₂
MW: 236.12 g/mol

ZX-036398

Warfarin Alcohol (Mixture of Diastereomers)

CAS: 28392-96-3
Formula: C₁₉H₁₈O₄
MW: 310.3 g/mol

ZX-027644

Warfarin Sodium - Impurity A

CAS: 15156-56-6
Formula: C₁₈H₁₆O₂
MW: 264.3 g/mol

ZX-023048

Warfarin Sodium Clathrate

CAS: 67430-45-9
Formula: C₁₉H₁₅NaO₄
MW: 330.3 g/mol

ZX-036399

Withanolide B

CAS: 56973-41-2
Formula: C₂₈H₃₈O₅
MW: 454.6 g/mol

ZX-036403

Xanthanoic acid

CAS: 82-07-5
Formula: C₁₄H₁₀O₃
MW: 226.23 g/mol

ZX-036050

Xylometazoline Hydrochloride

CAS: 1218-35-5
Formula: C₁₆H₂₅ClN₂
MW: 280.83 g/mol

ZX-023051

Z-Benfotiamine

CAS: 775256-41-2
Formula: C₁₉H₂₃N₄O₆PS
MW: 466.4 g/mol

ZX-032854

Z-Norgestimate

CAS: 107382-51-4
Formula: C₂₃H₃₁NO₃
MW: 369.5 g/mol

ZX-025883

Zafirlukast p-Tolyl Isomer

CAS: 1159195-70-6
Formula: C₃₁H₃₃N₃O₆S
MW: 575.7 g/mol

ZX-005536

Zasocitinib

CAS: 2272904-53-5
Formula: C₂₃H₂₄N₈O₃
MW: 460.5 g/mol

ZX-036411

Zileuton - Impurity A

CAS: 171370-49-3
Formula: C₁₁H₁₂N₂OS
MW: 220.29 g/mol

ZX-027654

Ziprasidone Deschloro Impurity

CAS: 118305-72-9
Formula: C₂₁H₂₂N₄OS
MW: 378.5 g/mol

ZX-027661

Ziprasidone Related Compound A

CAS: 87691-88-1
Formula: C₁₁H₁₄ClN₃S
MW: 255.77 g/mol

ZX-005537

Ziprasidone Related Compound C

CAS: 1303996-68-0
Formula: C₄₂H₄₀Cl₂N₈O₃S₂
MW: 839.9 g/mol

ZX-005538

Zofenopril Impurity 1

CAS: 72679-02-8
Formula: C₁₁H₁₂O₃S
MW: 224.28 g/mol

ZX-005539

Zofenopril Impurity 4

CAS: 57653-38-0
Formula: C₂₁H₂₃NO₇S
MW: 433.5 g/mol

ZX-005540

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