1-Cyclopropyl-6-nitro-4-oxo-7-piperazin-1-yl-1,4-dihydro-quinoline-3-carboxylic acid ethyl ester

ethyl 1-(t-butyl)-7-chloro-6-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylate

7-(3-Acetylamino-pyrrolidin-1-yl)-1-cyclopropyl-6-nitro-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid ethyl ester

ethyl ester of 7-(2-hydroxyethylamino)-6-nitro-4-oxo-1-cyclopropyl-1,4-dihydroquinoline-3-carboxylic acid

7-Chloro-1-(3-fluoro-phenyl)-6-nitro-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid