title: [Studies on beta-lactam antibiotics for medicinal purpose. VII. Synthesis of 6-[D-alpha-(5 and 6-alkyl-4-ethyl-2,3-dioxo-1-piperazinecarboxamido)phenylacetamido]-penicillanic acids and structure-antibacterial activity (author's transl)].
mesh_terms: D001419:Bacteria / Q000187:drug effects; D004352:Drug Resistance, Microbial; D010397:Penicillanic Acid / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship
chemical_list: D010397:Penicillanic Acid