1,8-Naphthyridine-3-carboxamide, 1,2-dihydro-4-hydroxy-2-oxo-1-phenyl-N-4-pyridinyl-, hydrate (5:3) 138304-91-3 4-Hydroxy-2-oxo-1-phenyl-N-(4-pyridyl)-1H-1,8-naphthyridine-3-carboxamide hydrate (5:3)