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. Author manuscript; available in PMC: 2022 Jul 14.
Published in final edited form as: Chem Rev. 2021 Jun 15;121(13):7957–8094. doi: 10.1021/acs.chemrev.1c00138

Figure 1.

Figure 1.

(Top) Structures of the four main classes of β-lactam antibiotics. (Bottom) Representative structures of antibiotics from each subclass, and of 2-azetidinone (shown in blue), the simplest compound containing a β-lactam ring.