2-Amino-7-[[2-[(2-amino-6-oxo-1,6-dihydro-9H-purin-9-yl)methoxy]ethoxy]methyl]-1,7-dihydro-6H-purin-6-one; 2-Amino-9-({2-[(2-amino-6-oxo-1,6-dihydro-7H-purin-7-yl)methoxy]ethoxy}methyl)- 1,9-dihydro-6H-purin-6-one; Aciclovir 7,9'-Diguanyl Analog; 9,7'-[1,2-Ethanediylbis(oxymethylene)]bisguanine; O-[(Guanin-7-yl)methyl] Aciclovir; 2-amino-9-((2-((2-amino-6-oxo-1,6-dihydro-7H-purin-7-yl)methoxy)ethoxy)methyl)-1,9-dihydro-6H-purin-6-one; 7,9'-Diguanyl analog