6-amino-5-[(4-amino-1,3-dimethyl-2,6-dioxopyrimidin-5-yl)methyl]-1,3-dimethylpyrimidine-2,4-dione

1,3-二甲基-6-氨基脲嘧啶

6,8-dimethyl-3-phenylpyrimido[5,4-e][1,2,4]triazine-5,7-dione

1,3-dimethylbenzo[g]pteridine-2,4-dione

1,3,6,8-tetramethylpyrimido[4,5-g]pteridine-2,4,7,9-tetrone