1-(5-Fluoro-2-pyridyl)-6-fluoro-(3,5-dimethyl-1-piperazinyl)-1, 4-dihydro-4-oxoquinoline-3-carboxylic acid 7-(3,5-Dimethyl-1-piperazinyl)-6-fluoro-1-(5-fluoro-2-pyridinyl)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid AIDS-146696 AIDS146696 NSC674547