5-chloroethyl-3-methyl-5,8-dihydro-8-oxoimidazo<4,5-b><1,8>naphthyridine-7-carboxylic acid

ethyl 5-chloroethyl-3-methyl-5,8-dihydro-8-oxoimidazo<4,5-b><1,8>naphthyridine-7-carboxylate

ethyl 1-chloroethyl-7-methylamino-6-nitro-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate