7-(2-acetamido-4,6-di-O-acetyl-2,3-dideoxy-D-threo-hex-2-enopyranosyl)theophilline

[5-acetamido-3-acetyloxy-6-(1,3-dimethyl-2,6-dioxopurin-7-yl)-3,6-dihydro-2H-pyran-2-yl]methyl acetate

1-[[2-(1,3-dimethyl-2,6-dioxopurin-7-yl)acetyl]amino]-3-phenylthiourea

7-(diethylaminomethyl)-1,3-dimethylpurine-2,6-dione

7-(2-chlorophenyl)-1,3-dimethylpurine-2,6-dione