1) 1-Ethyl-1,4-dihydro-4-oxo[1,3]dioxo[4,5g]cinnoline-3-carboxylic acid 2) 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid 3) 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperainyl)-1,8-naphthyridine-3-carboxylic acid 4) 1-cyclopropyl0-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid)