title: Effect of 6-alpha substitution in penicillins and 7-beta substitution in cephalosporins upon beta-lactam reactivity.
mesh_terms: D002511:Cephalosporins; D055598:Chemical Phenomena; D002621:Chemistry; D006868:Hydrolysis; D007700:Kinetics; D008968:Molecular Conformation; D010406:Penicillins; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins; D010406:Penicillins