7-Chloro-6-fluoro-4-oxo-1-quinolin-6-yl-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester

ethyl 1-(5-fluoro-2-pyridyl)-6-fluoro-7-chloro-1,4-dihydro-4-oxo-1,8 -naphthyridine-3-carboxylate

7-(3-Amino-pyrrolidin-1-yl)-6-fluoro-1-(5-fluoro-pyridin-2-yl)-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester

6-Fluoro-1-(3-fluoro-pyridin-4-yl)-4-oxo-7-piperazin-1-yl-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester

ethyl 1-(5-fluoro-2-pyridyl)-6-fluoro-7-(4-methyl-1-piperazinyl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylate