8-(hydroxymethyl)-3-methyl-7H-purine-2,6-dione

6-氨基-5-苄基氨基-1-甲基尿嘧啶

1,3,5,7-tetramethylpyrido[2,3-d]pyrimidine-2,4-dione

N-[6-methyl-3-(phenylcarbamoyl)-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]pyridine-3-carboxamide

1-methyl-6-phenylpteridine-2,4-dione