title: 2-(Alkylthio)penem-3-carboxylic acids. III. Synthesis of 6-ethylpenems.
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis*; D001419:Bacteria / Q000187:drug effects; D010397:Penicillanic Acid / Q000138:chemical synthesis* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D010397:Penicillanic Acid