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. 2022 Jan 19;12:818227. doi: 10.3389/fphar.2021.818227

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Copyright © 2022 He, Hu, Liu, Zhu, Zhang, You, Shao, Li, Zhang, Cui, He, Ge and Yang.

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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Chemical analysis of POL by UHPLC-Q-Orbitrap HRMS. The typical fngerprint chromatograms of the extract of POL (A) and reference standards (B). (1) Myricetin. (2) Quercetin. (3) Luteolin. (4) Kaempferol. (5) Apigenin.