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(A) The high-resolution ESI–MS of linear nonapeptide ions with RT 13.35 min and (B) HCD–MS/MS of the precursor ion [M + H]+ at m/z 1396.7715, (C) which was confirmed as a novel nonapeptide consisting of Glu-Orn-Tyr-Thr-Glu-Val-Pro- Gln-Tyr and a C12 β-OH fatty acid chain.
