title: The chemistry of penicillanic acids. Part III. A route to 1,2-secopenicillins.
mesh_terms: D010397:Penicillanic Acid / Q000138:chemical synthesis; D010404:Penicillin V / Q000031:analogs & derivatives; D010406:Penicillins / Q000138:chemical synthesis*
chemical_list: D010406:Penicillins; D010397:Penicillanic Acid; D010404:Penicillin V