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. 2013 Jun 10;18(6):6852–6865. doi: 10.3390/molecules18066852

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© 2013 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 license (http://creativecommons.org/licenses/by/3.0/).

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Chemical structures of reference compounds: (1) gallic acid (C₇H₆O₅), (2) catechin (C₁₅H₁₄O₆), (3) pyrogallol (C₆H₆O₃) and (4) tannic acid (C₇₆H₅₂O₄₆).