title: Structural studies on penicillin derivatives. IX. Synthesis of thiazolidine-azetidinones.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D006571:Heterocyclic Compounds / Q000138:chemical synthesis*; D010406:Penicillins / Q000138:chemical synthesis*; D013844:Thiazoles / Q000138:chemical synthesis
chemical_list: D002511:Cephalosporins; D006571:Heterocyclic Compounds; D010406:Penicillins; D013844:Thiazoles