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IT MS3 spectrum of the ion at m/z 189 (427 → 189) (a) and IT MS4 spectra of the ions at m/z 303 (427 → 412 → 303) (b) and m/z 265 (427 → 412 → 265) (c). The observation of the ion at m/z 97 in the latter two spectra demonstrated that both the m/z 303 and 265 ions contain an OSO3− group.
