9-[5'-O-(tert-butyldimethylsilyl)-2',3'-dideoxy-2'-fluoro-β-D-arabinofuranosyl]-9H-purine

[(3aR,5S,6aR)-2,2-dimethyltetrhydrofuro[2,3-d][1,3]dioxol-5-yl]methyl benzoate

5-O-benzoyl-2,3-dideoxy-1,2-difluoro-α-D-arabinofuranose

(6-chloropurin-9-yl)-trimethylsilane

((2S,4S,5R)-5-(6-chloro-9H-purin-9-yl)-4-fluorotetrahydrofuran-2-yl)methyl benzoate