2-(1,3,7-trimethyl-2,6-dioxopurin-8-yl)acetonitrile

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

8-[2,4,7,9-tetraoxo-3,6,8-trimethyl-1,3,6,8-tetraazaspiro (4-4) nonane-1-yl]-caffeine

柳酸咖啡鹼

1,3,7-trimethyl-8-(3-phenylpropoxy)purine-2,6-dione