title: Syntheses based on 1,2-secopenicillins. Part I. Oxidation.
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis*; D001384:Azetidines; D002511:Cephalosporins / Q000138:chemical synthesis; D055598:Chemical Phenomena; D002621:Chemistry; D008722:Methods; D010084:Oxidation-Reduction; D010406:Penicillins; D013237:Stereoisomerism
chemical_list: D000900:Anti-Bacterial Agents; D001384:Azetidines; D002511:Cephalosporins; D010406:Penicillins