4-oxo-7-[4-(1,3-thiazol-2-yl)-1-piperazinyl]-1-vinyl-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid

7-[4-(1,3-benzothiazol-2-yl)-1-piperazinyl]-4-oxo-1-vinyl-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid hydrochloride

7-chloro-4-oxo-1-vinyl-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid

4-Oxo-7-pyrrolidin-1-yl-1-vinyl-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid

7-(4-Acetyl-piperazin-1-yl)-4-oxo-1-vinyl-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid