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. 2019 Sep 13;11(9):2216. doi: 10.3390/nu11092216

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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Structure of main polyphenols classes. A: catechins; B: Epicathechins; C: Resveratrol; D: Caffeic acid; E: Proanthocyanidin; F: Epicatechin gallate; G: chlorogenic acid; H: Quercetin; I: Ellagitannin.