9-[(1S,3R,4S)-4-tert-butyldimethylsilyloxy-3-(tert-butyldimethylsilyloxymethyl)-2-methylene-cyclopentyl]-6-chloro-9H-purine-2-amine

tert-butyl 2-[bis(tert-butoxycarbonyl)amino]-6-chloro-9H-purine-9-carboxylate

3-(tert-butyl-diphenyI-silanyloxy)-2-trityloxymethyl-cyclo-pentanol

3-(tert-butyl-diphenyl-silanyloxy)-2-trityloxymethyl-cyclo-pentanone

tert-butyl(((1S,2R)-3-((tert-butyldimethylsilyl)oxy)-2-((trityloxy)methyl)cyclopent-3-en-1-yl)oxy)diphenylsilane