6-Amino-1-(2-chloro-ethyl)-7-methylamino-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester

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

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

6-amino-1-chloroethyl-7-methoxy-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid

ethyl 6-amino-7-chloro-1-chloroethyl-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate