8-ethylsulfanyl-1,3,7-trimethylpurine-2,6-dione

1,3,7-trimethyl-8-phenylpurine-2,6-dione

8-amino-1,3,7-trimethylpurine-2,6-dione

8-(morpholin-4-yl)quinoline-5,6-dione

1,3,7-三甲基-8-甲基氨基-嘌呤-2,6-二酮