4-Pyrimidinol (CAS NO.51953-18-5) is also named as 1H-Pyrimidin-4-one ; 3H-Pyrimidin-4-one ; 4(1H)-Pyrimidinone ; 4(3H)-pyrimidinone ; 4(3H)-Pyrimidone ; 4(6)-Hydroxypyrimidine ; 4-Hydroxypyrimidine .