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. 2018 Aug 28;9:934. doi: 10.3389/fphar.2018.00934

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Copyright © 2018 Liang, Xu, Zhou, Brand, Chen and Zhao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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MS spectrums of 12 targeted metabolomics with MRM mode. (A) Reference standard; (B) sample (RPMR). 1, gallic acid; 2, proanthocyanidin B1; 3, proanthocyanidin B2; 4, catechin; 5, epicatechin; 6, cis-THSG; 7, trans-THSG; 8, epicatechin gallate; 9, emodin-8-O-β-D-glucoside; 10, physcion-8-O-β- D-glucoside; 11, Emodin; 12, Physcion.