1-[(2R,5S)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-3-phenylselanyl-2,5-dihydro-furan-2-yl]-1H-pyrimidine-2,4-dione

1-[(2R,5R)-5-(tert-Butyl-dimethyl-silanyloxymethyl)-4-phenylselanyl-2,5-dihydro-furan-2-yl]-1H-pyrimidine-2,4-dione

(R)-3-(tert-Butyl-dimethyl-silanyloxy)-2-[(R)-1-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-2-oxo-ethoxy]-propionaldehyde

5'-O-[(tert-butyl)dimethylsilyl]-2'-O-{[(triisopropylsilyl)oxy]methyl}uridine 3'-(2-cyanoethyl diisopropylphosphoramidite)

(2R,3R,4R,5R)-2-(((bis(2-bromoethoxy)phosphorothioyl)oxy)methyl)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3,4-diyl diacetate