title: Conversion of penicillin to cephalosporin lactones.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D007783:Lactones / Q000138:chemical synthesis*; D008722:Methods; D010406:Penicillins
chemical_list: D002511:Cephalosporins; D007783:Lactones; D010406:Penicillins