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. 2020 May 8;11:579. doi: 10.3389/fphar.2020.00579

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Copyright © 2020 Wang, Xu, Guo, Huang, Ha, Zhang, Bai, Cui, He and Liu

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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Identification of major components of QX1 formula. QX1 formula sample were examined using UPLC–MS/MS. Base peak intensity chromatogram in the positive (A) and negative (B) ion modes for QX1 formula were shown as indicated. UPLC–MS/MS, Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry.