6-fluoro-7-(1-piperazinyl)-1-(2'-phenyl-1'-cyclopropyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, ((+)1'R,2'S)-isomer
6-fluoro-7-(1-piperazinyl)-1-(2'-phenyl-1'-cyclopropyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, ((+)1'r,2's)-isomer