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Chromatogram of phenolic acids (acquired in MRM mode) found in the intractum. Monitored MRM transitions are given in brackets: 1: protocatechuic acid (m/z 152.9→107.8); 2: 4-hydroxybenzoic acid (m/z 136.8→92.9); 3: vanillic acid (m/z 166.8→107.9), 4: trans-caffeic acid (m/z 178.7→134.9); 5: trans-p-coumaric acid (m/z 162.7→119), and 6: trans-ferulic acid (m/z 192.8→177.9). Unnumbered peaks represent uncharacterized constituents. Please refer to Supplementary Material for details.
