title: NMR studies of penicillins and cephalosporins. III. 3-Methylene substituent effect on structure-reactivity relationship of cephalosporins studied by carbon-13 NMR spectroscopy.
mesh_terms: D001419:Bacteria / Q000187:drug effects; D002247:Carbon Isotopes; D002511:Cephalosporins / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D013329:Structure-Activity Relationship
chemical_list: D002247:Carbon Isotopes; D002511:Cephalosporins