1,8-Naphthyridine-3-carboxylic acid, 1,2-dihydro-4-hydroxy-2-oxo-1-phenyl-, 2,2-dimethylhydrazide 138304-92-4 N-Dimethylamino-4-hydroxy-2-oxo-1-phenyl-1H-1,8-naphthyridine-3-carboxamide