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. 2022 Jan 6;114(3):e24254. doi: 10.1002/pep2.24254

FIGURE 1.

FIGURE 1

HCD MS/MS fragmentation spectrum of 1a. Annotations for selected y peptide fragment ions are shown. Standard peptidic fragment ion nomenclature[ 33 ] was adapted by using the illustrated arbitrary 1–5 numerical assignments for the isomeric ring‐opening intermediates