(1S,5R,6S)-5-(4,4'-dimethoxytrityloxymethyl)-6-hydroxy-1-(uracil-1-yl)-3,8-dioxabicyclo[3.2.1]octane

1-[1',4'-di-O-benzyl-3'-deoxy-5'-C-hydroxymethyl-β-D-psicofuranosyl]uracil

1-[1',4'-di-O-benzyl-3'-deoxy-5'-C-methanesulfonyloxymethyl-6'-O-methanesulfonyl-β-D-psicofuranosyl]uracil