5'-O-(4,4'-dimethoxytrityl)-2,2'-O-anhydro-1-(β-D-arabinofuranosyl)uracil 3'-O-trichloroacetimidate

2',3'-O-isopropylidene-5'-deoxyuridine

(2R,3R,4R,5R)-2-(acetoxymethyl)-5-(4-(dimethylamino)-2-oxopyrimidin-1(2H)-yl)tetrahydrofuran-3,4-diyl diacetate

O2,2'-anhydro-1-(β-D-arabinofuranosyl)uracil

1-(2'-C-methyl-β-D-arabinofuranosyl)uracil