parecoxib di sulfonamide

Parecoxib di sulfonamide is a process-related impurity derived from the parent NSAID prodrug Parecoxib, featuring an additional sulfonamide moiety appended to the valdecoxib core via a methylene bridge. This compound retains the ester-linked pyrrolidine ring of Parecoxib but exhibits dual sulfonamide functionalities, one conjugated to the pyrazole nitrogen and a second appended to the aromatic sulfonamide substituent. The di-sulfonamide configuration arises from a synthetic side reaction during API synthesis, introducing steric hindrance and altered solubility profiles. It serves as a critical HPLC reference standard for quantifying process impurities in Parecoxib formulations.