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The MALDI LIFT TOF-TOF spectrum of the M+ ions of (a) 3-hydroxy-heptadecanoic acid-AMPP at m/z 453, (b) 2-hydroxy-tetraeicosanoic acid-AMPP at m/z 551, and (c) 12-hydroxy-9-cis-octadecenoic acid-AMPP at m/z 465. The facile cleavage of the C-C(OH) bond distal to the aliphatic tail, is reflected by the dominance of the ions as marked (in pink).
