[(2R,5R)-5-[(2-amino-6-oxo-3H-purin-9-yl)methyl]oxolan-2-yl]phosphonic acid [(2R,5R)-5-[(2-amino-6-oxo-3H-purin-9-yl)methyl]tetrahydrofuran-2-yl]phosphonic acid [(2R,5R)-5-[(2-amino-6-oxo-3H-purin-9-yl)methyl]-2-tetrahydrofuranyl]phosphonic acid [(2R,5R)-5-[(2-amino-6-keto-3H-purin-9-yl)methyl]tetrahydrofuran-2-yl]phosphonic acid AIDS-107461 AIDS107461 BCH-1570 cis-2-Dihydroxyphosphinoyl-5-(Guanin-9'-yl-methyl)-tetrahydrofuran