176773-03-8 1H-Pyrimidin-4-one 4(1H)-PYRIMIDINONE 4-Hydroxypyrimidine 4-Oxopyrimidine 4-Oxypyrimidine 4-Pyrimidinol 4-Pyrimidinol (VAN) 4-Pyrimidinone 4-Pyrimidone 4562-27-0 542-27-8 6-Hydroxypyrimidine AI3-52024 Deaminoisocytosine EINECS 224-932-4 NSC 1575 NSC 157911