1-[(3aR,4R,6R,6aR)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-2-phenyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yloxy]-1H-pyrimidine-2,4-dione
1-[(3aR,4S,6R,6aR)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-2-phenyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yloxy]-1H-pyrimidine-2,4-dione
1-((3aR,4R,6R,6aR)-2,2-Dimethyl-6-trityloxymethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yloxy)-1H-pyrimidine-2,4-dione
1-((3aR,4S,6R,6aR)-2,2-Dimethyl-6-trityloxymethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yloxy)-1H-pyrimidine-2,4-dione
1-((2S,3R,4R,5R)-3,4-Bis-benzyloxy-5-benzyloxymethyl-tetrahydro-furan-2-yloxy)-1H-pyrimidine-2,4-dione