5-(azidomethyl)-2'-deoxy-5'-O-pivaloyluridine

[(2R,3R,4R,5R)-5-[Bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-(tert-butyl-dimethyl-silanyloxy)-2-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yloxy]-acetic acid

5-(aminomethyl)-2'-deoxy-5'-O-pivaloyl-3'-O-(tetrahydro-2H-pyran-2-yl)uridine

2'-O-{2-{{{1-[2'-deoxy-5'-O-pivaloyl-3'-O-(tetrahydro-2H-pyran-2-yl)-β-D-ribofuranosyl]-1,2,3,4-tetrahydro-2,4-dioxopyrimidin-5-yl}methyl}amino}-2-oxoethyl}-5'-O-(4,4'-dimethoxytrityl)uridine