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 All have beta lactam ring EXCEPT: and explain in detail?
ANSWER: (B) LinezolidREF: Goodman and Gillman 11th edition page 780"Linezolid is a synthetic antimicrobial agent of the oxazolidinone class"The three classes of drugs which have beta lactam ring in its structure are:Penicillins consist of a thiazolidine ring connected to a b-lactam ring, to which is attached a side chainCephalosporins are produced from 7-aminocephalosporanic acid by the addition of different side chains. Modifications at position 7 of the b-Iactam ring alter antibacterial activity, while substitutions at position 3 of the dihydrothiazine ring alter the metabolism and pharmacokinetic properties.IILCarbapenems are b-lactams that have a broader spectrum of activity than most other fa- lactam antibiotics