2-Benzyloxy-5-(2'-p-toluenesulfonyl-oxyethyl)-2-oxo-1,3,2-dioxaphosphorinane

(6-(benzyloxy)-2-((((4-nitrobenzyl)oxy)carbonyl)amino)-9H-purin-9-yl)methyl pivalate

(6-(benzyloxy)-2-(((1-(4-nitrophenyl)ethoxy)carbonyl)-amino)-9H-purin-9-yl)methyl pivalate

4-nitrobenzyl (6-(benzyloxy)-9H-purin-2-yl)carbamate