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

6-氨基-5-甲酰氨基-1,3-二甲基尿嘧啶

1-methyl-7-[(pivaloyloxy)methyl]xanthine

1,7-dimethyl-6-sulfinyl-1,3,6,7(9)-tetrahydro-purin-2-one

5-acetylamino-6-amino-1,3-dimethyl-1H-pyrimidine-2,4-dione