7-[4-(1,3-dimethyl-2,6-dioxopurin-7-yl)-4-oxobutanoyl]-1,3-dimethylpurine-2,6-dione

7-(4-chlorobutyl)-1,3-dimethylpurine-2,6-dione

6-(1,3-dimethyl-2,6-dioxopurin-7-yl)hexanoic acid

8-(1-hydroxyethyl)-1,3-dimethyl-7H-purine-2,6-dione

1,3-dimethyl-7-trimethylsilylpurine-2,6-dione