pefloxacin N-oxide;1-Ethyl-3-carboxy-6-fluoro-1,4-dihydro-7-(4-methylpiperazino)-4-oxoquinoline 1-oxide;N-Oxide-pefloxacin;Pefloxacin EP Impurity D (Pefloxacin N-Oxide);Pefloxacin EP Impurity D;3-Quinolinecarboxylic acid, 1-ethyl-6-fluoro-1,4-dihydro-7-(4-methyl-4-oxido-1-piperazinyl)-4-oxo-;Pefloxacin Mesilate Dihydrate Impurity D;Pefloxacin Mesilate Dihydrate EP Impurity D