You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is b - Lactam ring is present in and explain in detail?
All penicillins have the basic structure. A thiazolidine ring (A) is attached to a b-lactam ring (B) that carries a secondary amino group (RNH-).Reference: Katzung&;s Pharmacology; 13th edition; Chapter 43; Beta-Lactam & Other Cell Wall- & Membrane-Active Antibiotics