1-((2R,3R,4R,5R)-3-(((2,3-dimethylbutan-2-yl)dimethylsilyl)oxy)-5-((((2,3-dimethylbutan-2-yl)dimethylsilyl)oxy)methyl)-4-hydroxytetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

1-[2,5-O-bis(tert-butyldimethylsilyl)-3-O-phenylthiocarbonyl-β-D-pentofuranosyl]-uracyl

2'-O-thexyldimethylsilyl-5'-O-trityluridine

3'-O-phenoxythiocarbonyl-2'-O-thexyldimethylsilyl-5'-O-trityluridine