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. 2021 Sep 24;26(19):5781. doi: 10.3390/molecules26195781

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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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Antioxidative mechanism of quercetin. Quercetin is oxidized into oxidation products (QQ: ortho-quinone) and reacts with glutathione (GSH) to form 6-glutathionyl quercetin (6-GSQ) and 8-GSQ.