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. 2018 Jul 4;13:35. doi: 10.1186/s13020-018-0192-y

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Chemical structures of the natural products. a magnolol; b oleanolic acid; c curcumin; d toosendanin; e camptothecin; f tanshinone I; g artemisinin; h nitidine chloride; i ginsenoside Rg1; j baicalein; k astragaloside IV; l platycodin D; m celastrol; n ginsenoside Rg3; o berberine