2-Amino-5,6-dimethyl-1H-pyrimidin-4-one 3977-23-9 4(1H)-Pyrimidinone, 2-amino-5,6-dimethyl- 4-Pyrimidinol, 2-amino-5,6-dimethyl- (8CI) EINECS 223-611-6 NSC 66052