1,8-Naphthyridine-3-carboxylic acid, 1,2-dihydro-2-oxo-, ethyl ester
1,8-Naphthyridine-3-carboxylic acid, 2-hydroxy-, ethyl ester
1,2-Dihydro-2-oxo-1,8-Naphthyridine-3-carboxylic acid ethyl ester
Ethyl 2-hydroxy-1,8-naphthyridine-3-carboxylate
Ethyl 2-oxo-1,2-dihydro-1,8-naphthyridine-3-carboxylate
2-Oxo-1,2-dihydro-[1,8]naphthyridine-3-carboxylic acid ethyl ester