Fig. 2.

Proposed fragmentation scheme of BTX-2 (top panel) showing major product ions and associated water loss ions identified by comparison of HRMS/MS spectra (m/z 63–955) for BTX-2 (A), BTX-3 (B), and BTX-B5 (C) standards. Fragmentation was achieved using a collision energy of 35 eV. Spectra represent the average of multiple scans for each standard. Product ions are color-coded to indicate origin from either the head (blue) or tail (red) of the molecule. General nomenclature for MS/MS product ions of ladder-like polyether compounds used to predict BTX fragmentation pathways (Kryuchkov et al., 2020) is shown in the inlay.