5'-O-DMTr-2-N-diNPEOC-2'-deoxyguanosine

2,6-diamino-9-<3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxy-β-D-erythro-pentofuranosyl>purine

6-methoxy-9-<3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxy-β-D-erythro-pentafuranosyl>-2-ureidopurine

2-<(methoxycarbonyl)amino>-6-(methylthio)-9-<3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxy-β-D-erythro-pentofuranosyl>purine

3',5'-bis-O-(tert-butyldimethylsilyl)-2'-deoxy-6-O-methyl-2-N-(methoxycarbonyl)guanosine