title: Studies related to penicillins and cephalosporins. II. An approach to the synthesis of  -lactam antibiotics.
mesh_terms: D000588:Amines / Q000138:chemical synthesis*; D002511:Cephalosporins; D007769:Lactams / Q000138:chemical synthesis; D010406:Penicillins; D013329:Structure-Activity Relationship
chemical_list: D000588:Amines; D002511:Cephalosporins; D007769:Lactams; D010406:Penicillins