title: Synthetic studies related to nuclear analogues of the penicillins and cephalosporins.
mesh_terms: D002511:Cephalosporins; D055598:Chemical Phenomena; D002621:Chemistry; D007769:Lactams / Q000138:chemical synthesis; D008722:Methods; D010406:Penicillins; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins; D007769:Lactams; D010406:Penicillins