Descyano Hydroxy Febuxostat

Descyano Hydroxy Febuxostat is a structurally modified analog of Febuxostat, characterized by the substitution of the cyano group (–CN) at the isobenzofuran ring with a hydroxyl (–OH) moiety. This transformation introduces a polar hydroxyl functionality, altering the compound's electronic and steric properties relative to the parent drug. The core structure retains the sulfonamide linkage and nicotinic acid scaffold, maintaining key interactions with xanthine oxidase. This impurity likely arises via hydrolytic degradation of the cyano group during synthetic processes or storage. It serves as a critical HPLC reference standard for quantifying process-related impurities in Febuxostat formulations.