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(a) UPLC-ESI(–)-HRMS chromatograms of (i) water/methanol (HA), (ii) methanol (ME), and (iii) ethyl acetate (EtOAc) total extracts of S. sipylea. (b) Extracted ion chromatogram (XIC) of xanthomicrol, detected mainly in the EtOAc extract. (c) High-resolution mass spectrometry (HRMS) spectra indicating the fragmentation pattern of xanthomicrol; full scan (top trace) and HRMS2 to HRMS4 spectra.
