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. 2021 Apr 22;10(5):483. doi: 10.3390/antibiotics10050483

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Base structural nucleus of β-lactam antibiotics and some representative examples of natural beta-lactam antibiotics produced by Actinomycetes [38,39,40,41,42,43,44,45,46,47,48,49,50,51].