8-氯-3,7-二氢-1,3,7-三甲基-1H-嘌呤-2,6-二酮

5,6-diamino-3-methyl-1H-pyrimidine-2,4-dione

原甲酸三乙酯

N-(6-amino-3-methyl-2,4-dioxo-1H-pyrimidin-5-yl)formamide

8-chloro-1-methyl-3,7(9)-dihydro-purine-2,6-dione