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6-[2-(ethoxycarbonyl)methyl]-9-(tetrahydropyran-2-yl)-9H-purine

9-((3aR,4R,6R,6aR)-6-(((tert-butyldimethylsilyl)oxy)methyl)-4-(fluoromethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)-6-chloro-9H-purine

9-(3'-azido-5'-O-benzoyl-3'-deoxy-β-D-ribofuranosyl)-6-chloro-9H-purine

黄嘌呤