title: C-substitution of nucleosides with the aid of the Eschenmoser sulfide contraction.
mesh_terms: D011684:Purine Nucleosides / Q000138:chemical synthesis*; D011741:Pyrimidine Nucleosides / Q000138:chemical synthesis*; D013872:Thionucleosides / Q000138:chemical synthesis
chemical_list: D011684:Purine Nucleosides; D011741:Pyrimidine Nucleosides; D013872:Thionucleosides