2(1H)-Pyrimidinone, monohydrochloride 2-Hydroxypyrimidine hydrochloride 2-Pyrimidinol, hydrochloride 2-Pyrimidinone hydrochloride 38353-09-2 NSC56052 Pyrimidin-2-one hydrochloride Pyrimidin-2-one monohydrochloride