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Collision-induced dissociation tandem MS spectra (m/z 50–1050) of purified gambierone generated from (A) the [M–H]− parent ion (m/z 1023.3) in –ESI mode, collision energy 70 eV, showing a single dominant fragment ion representing the bisulphate anion (m/z 96.8) and (B) the [M+H]+ parent ion (m/z 1025.3) in +ESI mode, collision energy 25 eV, showing a variety of unassigned fragment ions.
