1) 9-fluoro-2,3-dihydro-3-methyl-10(4-methyl-1-piperaziny l)-7-oxo-7H-pyrido[1,2,3-de]-1,4,-benzoxacine-6-carboxylic acid 2) 1-ethyl-6,8-difluoro-1,4-dihydro-7-(3-methyl-1-piperaziny l)-4-oxo-quinolinecarboxylic acid 3) (cis)-5-amino-1-cyclopropyl-7-(3,5-dimethyl)-1-piperazinyl)-6,8-difluoro-1,4-dihydro-4-oxo-quinolinecarboxylic acid