8-bromoacetyl-1,3,7-trimethyl-3,7-dihydro-purine-2,6-dione
1,3,7-trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purine-8-carboxylic acid amide
8-acetyl-1,3-dimethyl-3,7-dihydro-purine-2,6-dione
2,3,6,7-tetrahydro-1,3,7-trimethyl-2,6-dioxo-1H-purine-8-carbonitrile
8-(1-hydroxyethyl)-1,3-dimethyl-3,7-dihydro-1H-purine-2,6-dione