ethyl 7-chloro-1-ethyl-6-fluoro-4-oxoquinoline-5-carboxylate; ethyl 7-chloro-1-ethyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate; Pefloxacin Mesilate Dihydrate Impurity G (As per 35.1 EP Monograph); N-Ethyl Ester; 3-Quinolinecarboxylic acid, 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-, ethyl ester; Ethyl 7-chloro-1-ethyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate