9,5'-cyclo-3-(2,3-O-isopropylidene-β-D-ribofuranosyl)-8-azaxanthine

5'-O-benzoyl-2',3'-O-isopropylidene-5-bromouridine

5-bromo-2',3'-O-isopropylidene-5'-O-(p-toluenesulfonyl)uridine

((3aR,4R,6R,6aR)-6-(5-bromo-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl methanesulfonate

5'-azido-5-bromo-5'-deoxy-2',3'-O-isopropylidene-uridine