9-[(1S,3R,4S)-4-tert-butyldimethylsilyloxy-3-hydroxymethyl-2-methylene-cyclopentyl]-6-chloro-9H-purine-2-carbamic acid tert-butyl ester

tert-butyl 6-(benzyloxy)-9-((4aR,6S,7aS)-5-methylene-2-phenylhexahydrocyclopenta[d][1,3]dioxin-6-yl)-9H-purin-2-ylcarbamate

6-chloro-9-[(1S,3R,4S)-4-hydroxy-3-hydroxymethyl-2-methylene-cyclopentyl]-9H-purine-2-carbamic acid tert-butyl ester

6-chloro-9-[(1S,3R,4S)-4-hydroxy-3-hydroxymethyl-2-methylene-cyclopentyl]-N-(tert-butyloxycarbonyl)-9H-purine-2-carbamic acid tert-butyl ester