8-(3-chloro-propyl)-1,3,7-trimethyl-3,7-dihydro-purine-2,6-dione
ethyl-(1,3,7-trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)-malonic acid diethyl ester
diethyl 2-(1,3,7-trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)malonate
3-(1,3,7-trimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)-thiopropionic acid S-benzyl ester
8-(3-hydroxy-propyl)-1,3,7-trimethyl-3,7-dihydro-purine-2,6-dione