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. 2019 Nov 7;9(11):271. doi: 10.3390/metabo9110271

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© 2019 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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(a) HPLC-ESI-MS chromatogram of G. gelida herb extract in SIM-mode (m/z 315). (b, c) Mass spectra (negative ionization) of compounds 11 (2,3-dihydroxybenzoic acid 2-O-glucoside) and 16 (2,3-dihydroxybenzoic acid 3-O-glucoside), respectively. (d) UV spectra of compounds 11 and 16.