1-(5'-O-(4-monomethoxytrityl)-2',3'-dideoxy-β-D-glycero-pent-2'-eno-furanosyl)uracil

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

5'-O-(tert-butyldimethylsilyl)-2',3'-O-thionocarbonyluridine

1-(3,5-di-O-acetyl-2-bromo-2-deoxy-β-D-ribofuranosyl)-uracil

1-(5-O-tert-butyldiphenylsilyl-β-D-ribofuranosyl)uracil