ethyl 7-methyl-4-oxo-1,8-naphthyridine-3-carboxylate

ethyl 7-Methyl-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate

1,4-Dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid ethyl ester