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G-TIMS EED MS/MS analysis of a mixture of reduced and permethylated LNFP II and III. (a) EIMs of the [M+Na]+ precursor ions at m/z 1117.584 and two fragment ions at m/z 442.204 and m/z 472.215; (b-e) EED spectra acquired at four elution voltages marked in (a). Isomer-diagnostic fragments are labeled in color.
