6-氨基-5-溴-1-甲基尿嘧啶

1-(2,3-dihydroxypropyl)-3-methyl-7H-purine-2,6-dione

6-氨基-5-丙基氨基-1-甲基尿嘧啶

6-氨基-1,3-二甲基吡啶并[2,3-d]嘧啶-2,4(1h,3h)-二酮

1-benzyl-3-methyl-7H-purine-2,6-dione