Descarboxyl Levofloxacin Descarboxyl Levofloxacin IMpurity Levofloxacin Descarboxy IMpurity (S)-9-fluoro-3-methyl-10- (4-methylpiperazin-1-yl)-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinolin-7-one (-)-(S)-9-Fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine (S)-9-fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinolin-7-one hydrochloride (S)-Ofloxacin EP Impurity B (Decarboxyl Levofloxacin) Levofloacin Impurity 28