8-[(4-aminophenyl)methyl]-1,3-dimethyl-7H-purine-2,6-dione

8-[2-(4-benzhydrylpiperazin-1-yl)ethyl]-1,3-dimethyl-7H-purine-2,6-dione

1,3-dimethyl-7-phenylpteridine-2,4-dione

4,6-二甲基[1,2,5]噻二唑并[3,4-d]嘧啶-5,7(4H,6H)-二酮

(6-氨基-1,2,3,4-四氢-1,3-二甲基-2,4-二羰基-5-嘧啶基)氨基甲酸乙酯