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1,4-Dihydro-1-ethyl-6,8-difluoro-7-(4-methylpiperazin-1-yl)-4-oxoquinoline-3-carboxylic acid 1-Ethyl-6,8-difluoro-1,4-dihydro-7-(4-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acid 1-ethyl-6,8-difluoro-7-(4-methyl-1-piperazinyl)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid 3-Quinolinecarboxylic acid, 1-ethyl-6,8-difluoro-1,4-dihydro-7-(4-methyl-1-piperazinyl)-4-oxo-