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(A) The high-resolution ESI–MS of linear heptapeptide ions eluted with RT in the range 13.52–14.69 min and (B) HCD–MS/MS of the precursor ion [M + H]+ at m/z 1107.6598, (C) which was confirmed as a novel heptapeptide consisting of Glu-Orn-Tyr-Thr-Glu-Ala-Ile and a C13 β-OH fatty acid chain.
