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UPLC-MS/MS multiple reaction mode (MRM) chromatograms of (a) mixed standards and (b) M. officinalis samples. 1, monotropein; 2, deacetyl asperulosidic acid; 3, asperulosidic acid; 4, asperuloside; 5, rubiadin-1-methyl ether; 6, rubiadin; IS, jaceosidin. Analyte numbering in the test is the same as in this figure.
