(1R,3R,4R,7S)-(4,4'-dimethoxytrityloxymethyl)-7-hydroxy-5-methyl-3-(4-benzoyl-5-methylcytosin-1-yl)-2-oxa-5-azabicyclo[2.2.1]heptane

(1R,3R,4R,7S)-7-benzyloxy-1-hydroxymethyl-3-(thymin-1-yl)-2-oxa-5-azabicyclo[2.2.1]heptane