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The HCD MS2 spectra of the [M + H]+ ions of the anteiso-17:0-AMPP derivative at m/z 437 (a), and of anteiso-15:0-AMPP derivative at m/z 409 (b) from L. monocytogenes, and of the standard iso-17:0-AMPP derivative at m/z 437 (c). The location of the methyl side chain is located by the observation of the 28 Da gap as shown in the fragmentation schemes in the inset of each spectrum.
