5-hydroxy-1H-pyridin-2-one 5-hydroxy-2-pyridone 5154-01-8 24154-26-5 AC-907/25004408 CHEBI:16364 2,5-Pyridinediol NSC 224189 pyridine-2,5-diol 2,5-Dhpy 2,5-Dihydroxypyridine C01059 2(1H)-Pyridinone, 5-hydroxy- NSC224189