N1-(6''-monomethoxytrityloxyhexyl)-5'-O-[bis(phenylthio)phosphoryl]-2',3'-O-isopropylideneadenosine

5-[(methoxymethylene)amino]-1-[5-O-(tert-butyldimethylsilyl)-2,3-O-(isopropylidene)-β-D-ribofuranosyl]imidazole-4-nitrile