[9-[(2R,4S,5R)-4-(tert-Butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-6-(3-nitro-[1,2,4]triazol-1-yl)-9H-purin-2-yl]-trityl-amine

3',5'-bis-O-[(tert-butyl)dimethylsilyl]-N2-2[(cyanoethoxy)carbonyl]-2'-deoxy-O6-[(2,4,6-triisopropylphenyl)sulfonyl]guanosine

Trifluoro-methanesulfonic acid 9-[(2R,4S,5R)-4-(tert-butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-6-[2-(4-nitro-phenyl)-ethoxy]-9H-purin-2-yl ester

N2-[10S-(7S,8R,9R-triacetoxy-7,8,9,10-tetrahydrobenzo[a]pyrenyl)]-O6-allyl-3',5'-di-O-(tert-butyldimethylsilyl)-2'-deoxyguanosine