title: Total synthesis of nuclear analogues of 7-methylcephalosporin.
mesh_terms: D002264:Carboxylic Acids / Q000138:chemical synthesis; D002511:Cephalosporins / Q000138:chemical synthesis*; D009682:Magnetic Resonance Spectroscopy; D013055:Spectrophotometry, Infrared
chemical_list: D002264:Carboxylic Acids; D002511:Cephalosporins