2'-O-acetyl-5'-O-(4,4'-dimethoxytrityl)-3'-deoxy-3'-{[N-(5'-deoxythymidine-5'-yl)carboxamido]methyl}ribothymidine

Benzoic acid (2S,3R,4R,5S)-4-acetoxy-3-({[(2R,3S,5R)-3-(tert-butyl-diphenyl-silanyloxy)-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-ylmethyl]-carbamoyl}-methyl)-5-phenylsulfanyl-tetrahydro-furan-2-ylmethyl ester