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. 2018 Sep 10;18:250. doi: 10.1186/s12906-018-2309-3

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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 — HPLC chromatogram of WPX test sample (a) and reference sample (b). Notes: Peak: 1, Calycosin-7-glucoside; 2, ginsenoside-Rg1; 3, ginsenoside-Rb1; 4, astragaloside IV; 5–7, atractylenolide III, II, and I, respectively