9-[(2-hydroxyethoxy)methyl]-2-(methylthio)adenine

5-(N'-Ethoxycarbonyl.S-methylisothiocarbamoyl)amino-1-[(2-hydroxyethoxy)methyl]-4-ethoxycarbonylimidazole

7-amino-5-(methylthio)[1,2,5]oxadiazolo[3,4-d]pyrimidine

7-formamido-5-(methylthio)furazano[3,4-d]pyrimidine

9-[[2-(benzoyloxy)ethoxy]methyl]-2-(methylthio)adenine