5’-O-三苯甲基胸苷

5’-三苯甲基-2’-脱氧-2,3’-双脱氢胸苷

5'-O-三苯甲基-2',3'-去氢胸苷

3'-O-ethyl-thymidine 5'-trityl ether

5’-O-Trityl-3’-β-hydroxythymidine