2-Cyanoethyl {5'-[3-((3'R)-3'-deoxythymidin-3'-yl)-2-oxopropyl]-5'-deoxythymidin-3'-yl}(3'-acetylthymidin-5'-O-yl)phosphinate

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

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

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

2-Cyanoethyl (3'-O-acetylthymidin-5'-O-yl)[5'-O-(4,4'-dimethoxytrityl)thymidin-3'-O-yl]phosphinate

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

2-Cyanoethyl {5'-[(E)-3-((3'R)-3-benzyloxymethyl-5'-O-tert-butyldimethylsilyl-3'-deoxythymidin-3'-yl)-2-oxopropylidene]-5'-deoxythymidin-3'-O-yl}(3'-acetylthymidin-5'-O-yl)phosphinate

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

P-(2-cyano-ethyl)-thymidylyl-(3'->5')-O3'-acetyl-thymidine

(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

{(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

(3'-O-Acetylthymidin-5'-O-yl)(2-cyanoethoxy)[5'-O-(4,4'-dimethoxytrityl)thymidin-3'-O-yl]phosphane

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

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

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

3'-O-Acetyl-5'-{3-[(3'R)-5'-(4,4'-dimethoxytrityl)-3'-deoxythymidin-3'-yl]-2-oxopropyl}-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}-acetic acid