Bepotastine N-butyl ester

Bepotastine N-butyl ester is a piperidine-based ester derivative of the parent antihistamine Bepotastine, formed via esterification of the primary amine with butyric acid. The compound retains the core 2-(2H-1,2,3-triazol-2-yl)phenol scaffold and aromatic piperidine ring, with a butyl ester substituent at the nitrogen atom. This structural modification alters lipophilicity and metabolic stability compared to the parent drug. Synthetically, it arises as a side product during esterification steps in Bepotastine production. It serves as an HPLC reference standard for quantifying ester-related impurities in API batches.