2-Amino-6-methylpyrimidin-4-ol 3977-29-5 4(1H)-Pyrimidinone, 2-amino-6-methyl- 4-Methylisocytosine 6-Methylisocytosine AI3-08094 EINECS 223-612-1 Mecytosine NSC 13145 NSC 23662 NSC 41833 NSC 7893 Superacil Superacyl