7-(2,3-Dihydroxypropyl)-8-β-hydroxyethylaminotheophylline
8-Butylamino-7-(2,3-dihydroxy-propyl)-1,3-dimethyl-3,7-dihydro-purine-2,6-dione
7-(2,3-Dihydroxy-propyl)-1,3-dimethyl-8-methylamino-3,7-dihydro-purine-2,6-dione
8-Benzylamino-7-(2,3-dihydroxy-propyl)-1,3-dimethyl-3,7-dihydro-purine-2,6-dione
2-(8-bromo-1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purin-7-yl)acetaldehyde