1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid, 7-methyl-1,8-naphthyridin-4(1H)-one-3-carboxylic acid, 7-Methyl-4-oxo-1,4-dihydro-[1,8]naphthyridin-3-carbonsaeure, 7-Methyl-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid, 7-methyl-4-oxo-1,4-dihydro[1,8]naphthyridine 3-carboxylic acid,