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. 2022 Feb 14;27(4):1279. doi: 10.3390/molecules27041279

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© 2022 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 7 — Plausible biosynthetic pathways for 457a/457b.