1,4-Dihydro-6,8-difluoro-1-ethyl-7-(4-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acid 1-Ethyl-6,8-difluoro-1,4-dihydro-7-(1-(4-methylpiperazinyl))-4-oxoquinoline-3-carboxylic acid 3-Quinolinecarboxylic acid, 1,4-dihydro-6,8-difluoro-1-ethyl-7-(4-methyl-1-piperazinyl)-4-oxo- 75338-41-9