2′-Deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-fluoro-N-methyl-2-[(2-methyl-1-oxopropyl)amino]-4′-C-[[[(trifluoromethyl)sulfonyl]oxy]methyl]adenosine

4′-C-[[Bis(4-methoxyphenyl)phenylmethoxy]methyl]-2′-deoxy-3′-O-[(1,1-dimethylethyl)dimethylsilyl]-5′-O-[(1,1-dimethylethyl)diphenylsilyl]-2′-fluoro-N-methyl-2-[(2-methyl-1-oxopropyl)amino]adenosine