title: Structure-reactivity relationships of cephem analogs studied by carbon-13 NMR and IR spectroscopies. Replacement effects of sulfur with oxygen or methylene at the 1-position and introduction effects of 7 alpha-methoxy group.
mesh_terms: D002511:Cephalosporins / Q000494:pharmacology*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D013055:Spectrophotometry, Infrared; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins