1-Cyclopropyl-7-{3-[(ethylamino)methyl]-1-pyrrolidinyl}-6,8-diflu oro-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid

7-[3-(ethylaminomethyl)pyrrolidin-1-yl]-6,8-difluoro-1-(1-methylcyclopropyl)-4-oxoquinoline-3-carboxylic acid