1-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)-4-(methylthio)-6-methyluracil

5-bromo-2',3'-O-isopropylidene-5'-tetramethyldimethylsilane uridine

6-cyano-5'-O-(tert-butyldimethylsilyl)-2',3'-O-isopropylidene uridine