(S)-2-((6-oxo-2-((((6-oxo-6,9-dihydro-3H-purin-2-yl)amino)methyl)amino)-3H-purin-9(6H)-yl)methoxy)ethyl 2-amino-3-methylbutanoate;N2-(Guanine-N2-yl)methyl]-9-[(2-hydroxyethoxy)methyl]guanine-L-valinate
(S)-2-((6-oxo-2-((((6-oxo-6,9-dihydro-3H-purin-2-yl)amino)methyl)amino)-3H-purin-9(6H)-yl)methoxy)ethyl 2-amino-3-methylbutanoate;N2-(Guanine-N2-yl)methyl]-9-[(2-hydroxyethoxy)methyl]guanine-L-valinate