2-((6-Oxo-2-((((6-oxo-6,9-dihydro-1H-purin-2-yl)amino)methyl)amino)-1,6-dihydro-9H-purin-9-yl)methoxy)ethyl (tert-butoxycarbonyl)-L-valinate

2-((6-Oxo-2-((((6-oxo-6,9-dihydro-1H-purin-2-yl)amino)methyl)amino)-1,6-dihydro-9H-purin-9-yl)methoxy)ethyl (tert-butoxycarbonyl)-L-valinate