5-(2-chloroethyl)-2,2-dimethyl-1,3-dioxane

6-chloro-9-[2-(2,2-dimethyl-1,3-dioxan-5-yl)ethyl]purin-2-amine

2-[2-(2-amino-6-methoxypurin-9-yl)ethyl]propane-1,3-diol

[4-(2-amino-6-oxo-3H-purin-9-yl)-2-(hexanoyloxymethyl)butyl] hexanoate

[4-(2-amino-6-oxo-3H-purin-9-yl)-2-(formyloxymethyl)butyl] formate