9-fluoro-10-(N-(4'-methyl)piperazinyl)-7-oxo-2,3-dihydro-7H-pyrido(1,2,3de)-1,4-benzothiazine-6-carboxylic acid
9-fluoro-10-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]thiazino[2,3,4-ij]quinoline-6-carboxylic acid