Gatifloxacin acid impurity

Gatifloxacin acid impurity is a quinolone-derived compound characterized by a 8-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid scaffold with a truncated piperazine substituent at the C-7 position compared to the parent drug. The structural modification involves the absence of the N-methylpiperazine moiety, retaining the fluorine at C-8 and the carboxylic acid at C-3. This impurity arises as a synthetic byproduct during Gatifloxacin production via incomplete alkylation of the piperazine ring. Its application is specifically as an HPLC reference standard for quantifying process-related impurities in Gatifloxacin active pharmaceutical ingredients.