1-((2R,3R,5S)-3-morpholino-5-((trityloxy)methyl)tetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione

1-(5'-O-trityl-3'-deoxy-3'-(4-toluene)thio-β-D-arabinofuranosyl)uracil

1-(5'-O-trityl-3'-deoxy-3'-toluenesulfonyl-β-D-arabinofuranosyl)uracil

1-(5'-trityl-2',3'-dideoxy-3'-toluenesulfonyl-β-D-glyceropent-2-enofuranosyl)uracil

1-((2R,3S,4R,5R)-3-(piperidin-1-yl)-4-tosyl-5-((trityloxy)methyl)tetrahydrofuran-2-yl)pyrimidine-2,4(1H,3H)-dione