title: Substituent effects upon the base hydrolysis of penicillins and cephalosporins. Competitive intramolecular nucleophilic amino attack in cephalosporins.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D006868:Hydrolysis; D007700:Kinetics; D008968:Molecular Conformation; D010406:Penicillins / Q000138:chemical synthesis*; D013055:Spectrophotometry, Infrared; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins; D010406:Penicillins