SYNONYMS: 1-Ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid sodium salt; 1,4-Dihydro-1-ethyl-7-methyl-1,8-naphthyridin-4-one-3-carboxylic acid sodium salt; 3-Carboxy-1-ethyl-7- methyl-1,8-naphthyridin-4-one sodium salt; 1-Ethyl-7-methyl-1,8-naphthyridin-4-one-3-carboxylic acid sodium salt