哌啶

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

5’-O-三苯甲基尿苷-2’,3’-来苏-环氧化物

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