[9-((2R,3R,4S,5R)-3,4-Dihydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-9H-purin-6-yl]-carbamic acid 2-nitro-benzyl ester

6-chloro-9-(3-O-benzoyl-β-D-ribofuranosyl)purine

9-(3-O-benzoyl-2-O-benzyl-β-D-ribofuranosyl)-6-chloropurine

3-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)adenine

7H-purine-6-sulfonyl fluoride