Rabeprazole USP Related Compound A Sodium salt

Rabeprazole USP Related Compound A Sodium salt is a thiazole-based impurity derived from the parent drug Rabeprazole, featuring a 3-(3,4-dimethoxybenzoyl)-4-methylthiazole core with a sulfonyl group in place of the parent’s sulfinyl moiety. The sodium salt arises from deprotonation of the sulfonate functional group, enhancing its ionic character. This structural modification renders it a key oxidation byproduct during Rabeprazole synthesis or storage. It serves as a reference standard for HPLC-based impurity profiling in quality control of rabeprazole-containing pharmaceuticals.