7-(2-氨基乙基)-1,3-二甲基嘌呤-2,6-二酮

1,3-dimethyl-8-morpholin-4-yl-7H-purine-2,6-dione

7-[2-(Diethylamino)ethyl]-1,3-dimethylxanthine

1,2,3,6-四氢-1,3-二甲基-2,6-二氧代-7H-嘌呤-7-丙烷磺酸

1,3-二甲基-7-(6-氧代-1H-哒嗪-3-基)嘌呤-2,6-二酮