9-(2-(Benzyloxy)ethyl)-2-((2-(benzyloxy)ethyl)amino)-1H-purin-6-(9H)-one is an intermediate used in the synthesis of 9-(2-Hydroxyethyl)guanine (H942035), which is an impurity of the antiviral agent Acyclovir (A192400). 9-(2-Hydroxyethyl)guanine is a nucleoside phosphotransferase acceptor.