1-[(2R,4S,5S)-4-Allyl-5-(tert-butyl-dimethyl-silanyloxymethyl)-tetrahydro-furan-2-yl]-5-methyl-3-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrimidine-2,4-dione

(E)-3'-O-Acetyl-5'-(3-{(3'R)-5'-O-(tert-butyldimethylsilyl)-3-[(2-trimethylsilylethoxy)methyl]-3'-deoxythymidin-3'-yl}-2-oxopropylidene)-5'-deoxythymidine

{(2S,3R,5R)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-5-[5-methyl-2,4-dioxo-3-(2-trimethylsilanyl-ethoxymethyl)-3,4-dihydro-2H-pyrimidin-1-yl]-tetrahydro-furan-3-yl}-acetaldehyde

{(2S,3R,5R)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-5-[5-methyl-2,4-dioxo-3-(2-trimethylsilanyl-ethoxymethyl)-3,4-dihydro-2H-pyrimidin-1-yl]-tetrahydro-furan-3-yl}-acetic acid

1-[(2R,4R,5S)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-4-(2-imidazol-1-yl-2-oxo-ethyl)-tetrahydro-furan-2-yl]-5-methyl-3-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrimidine-2,4-dione