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Proton-pump inhibitorsIn stockImpurity reference standardPh. Eur.

Omeprazole Impurity A

JR-PP1001-02

Variant ofOmeprazole Sodium BP CRS

5-Methoxy-1H-benzimidazole-2-thiol (Ufiprazole thiol fragment); key starting material and hydrolytic/cleavage impurity of omeprazole and esomeprazole (EP Impurity A).

Structure & identifiers

2D structure — select to enlarge

Catalogue code
JR-PP1001-02
Category
Proton-pump inhibitors
CAS number
37052-78-1
Grade
Impurity reference standard
Pharmacopoeia
Ph. Eur.
Molecular formula
C8H8N2OS
Molecular weight
180.23 g/mol
Pack sizes
25 mg · 50 mg · 100 mg · 500 mg
Record updated
12 Nov 2026

Chemical name

Omeprazole Impurity A

SMILES

COc1ccc2[nH]c(S)nc2c1

Compound identity, CAS number, formula and structure are referenced from public chemical databases. Contact us to confirm availability, pack sizes and documentation for your order.

Omeprazole Impurity A

25 mg · ×1