title: Studies on beta-lactams. XXXVI. Monocyclic cis beta-lactams via penams and cephams.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D003500:Cyclization; D006863:Hydrogen-Ion Concentration; D010406:Penicillins / Q000031:analogs & derivatives / Q000138:chemical synthesis; D013057:Spectrum Analysis; D013237:Stereoisomerism; D047090:beta-Lactams / Q000138:chemical synthesis*
chemical_list: D002511:Cephalosporins; D010406:Penicillins; D047090:beta-Lactams