Rabeprazole Sulfide N-Oxide

Rabeprazole Sulfide N-Oxide is a degradation byproduct of Rabeprazole, characterized by a reduced sulfinyl group (sulfide) and an N-oxide moiety on the pyridine ring. Its structure retains the benzimidazole-thiazole core but features a sulfur atom at the sulfinyl position and an oxidized nitrogen in the heterocyclic ring. This impurity arises via redox processes during synthesis or storage. It serves as an HPLC reference standard for quantifying process-related impurities in rabeprazole formulations.