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. 2023 Nov 20;24(22):16514. doi: 10.3390/ijms242216514

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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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Generalized chemical formulas of flavonoids (5) and six subclasses of flavonoids: flavones (6), flavonols (7), flavanones (8), flavan-3-ols (9), isoflavones (10), and anthocyanidins (11).