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. 2014 Mar 17;9(3):e91809. doi: 10.1371/journal.pone.0091809

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© 2014 Chen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(1) Chemical structure of the condensed tannins. The 4 to 6 linkage (dotted line) is an alternative interflavan bond. The terminal unit is at the bottom the multi-unit structure. (2) Structure similarities between the flavan-3-ol monomer units and the substrates of tyrosinase.