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. 2017 Apr 22;22(4):670. doi: 10.3390/molecules22040670

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chromatograms of the extracted ions of verproside and its metabolites in the liquid chromatography-mass spectrometry (LC-MS)analysis of the assays using human hepatocytes. The extracted ion chromatograms were reconstructed based on deprotonated molecular ions: m/z 497.12939 for verproside, 673.16138 for M1 and M2 (verproside glucuronides), 577.08594 for M3 (verproside sulfate), 511.14484 for M4 (picroside II) and M5 (isovanilloylcatalpol), 687.17657 for M6 (picroside II glucuronide) and M7 (isovanilloylcatalpol glucuronide), and 591.10150 for M8 (picroside II sulfate) and M9 (isovanilloylcatalpol sulfate).