1-ethyl-1,2-dihydro-4-(4-carbethoxy-1-piperazinyl)-7-methyl-2-oxo-1,8-naphthyridine-3-carboxylic acid ethyl ester

4-chloro-1-ethyl-1,2-dihydro-7-methyl-2-oxo-1,8-naphthyridine-3-carbonitrile

1-ethyl-1,2-dihydro--4-hydroxy-7-methyl-2-oxo-1,8-naphthyridine-3-carboxamide

1-Ethyl-1,2-Dihydro-7-Methyl-2-Oxo-4-(1-Pyrrolidinyl)-1,8-Naphthyridine-3-Carbonitrile

1-ethyl-1,2-dihydro-7-methyl-4-(4-methyl-1-piperazinyl)-2-oxo-1,8-naphthyridine-3-carboxylic acid ethyl ester