((1S,3R,4R,7S)-7-(benzyloxy)-3-(2,6-diamino-7H-purin-7-yl)-2,5-dioxabicyclo[2.2.1]heptan-1-yl)methanol

9-((1R,3R,4R,7S)-7-(benzyloxy)-1-(((tert-butyldiphenylsilyl)oxy)methyl)-2,5-dioxabicyclo[2.2.1]heptan-3-yl)-2-chloro-9H-purin-6-amine

9-((1R,3R,4R,7S)-7-(benzyloxy)-1-((tert-butyldiphenylsilyloxy)methyl)-2,5-dioxabicyclo[2.2.1]heptan-3-yl)-2-fluoro-9H-purin-6-amine

((1S,3R,4R,7S)-3-(6-amino-2-fluoro-9H-purin-9-yl)-7-(benzyloxy)-2,5-dioxabicyclo[2.2.1]heptan-1-yl)methanol