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. 2023 Sep 4;28(17):6434. doi: 10.3390/molecules28176434

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© 2023 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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Scheme 20 — Synthetic pathway proposed by Sarlah [71] and Echavarren [73] to obtain the natural products ACBM (122) and R-CBM (123) and the synthetic diastereomer S-CBM (133).