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. 2023 Sep 12;28(18):6586. doi: 10.3390/molecules28186586

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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 2 — Synthesis of the intermediate compounds 7a–c.