{(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

(2R,3S,5R)-2-(4-((2S,3R,5R)-2-(hydroxymethyl)-5-(5-methyl-2,4-dioxo-3-((2-(trimethylsilyl)ethoxy)methyl)-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl)-3-oxobutyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl acetate

Acetic acid (2R,3S,5R)-2-{4-[(2S,3R,5R)-2-formyl-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yl]-3-oxo-butyl}-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yl ester

1-{(2R,4R,5S)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-4-[2-oxo-3-(triphenyl-λ5-phosphanylidene)-propyl]-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

5'-{3-[(3'R)-5'-(4,4'-Dimethoxytrityl)-3'-deoxythymidin-3'-yl]-2-oxopropyl}-3'-O-[2-cyanoethoxy(diisopropylamino)phosphino]-5'-deoxythymidine

5'-{3-[(3'R)-5'-(4,4'-Dimethoxytrityl)-3'-deoxythymidin-3'-yl]-2-oxopropyl}-5'-deoxythymidine