Bimatoprost free acid Impurity

Bimatoprost free acid impurity is a synthetic byproduct arising from the de-esterification of the parent drug's prodrug form. It retains the core cyclopentyl ring and conjugated diene system of bimatoprost but features a terminal carboxylic acid group instead of the ester moiety. This structural modification disrupts the lipophilic character of the parent compound, altering its pharmacokinetic profile. The compound serves as a critical HPLC reference standard for quantifying ester hydrolysis byproducts in bimatoprost API manufacturing processes.