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IRMPD spectra are reported for a 2 ions derived from trialanine (AAA) and triphenylalanine (FFF) and compared with spectra calculated by density functional theory at the B3LYP/6-311++G(d,p) level of theory. At low collision energies the cyclic N 1 -protonated imidazolidinone ion C1 is dominant, but at higher collision energies the rearranged product, linear protonated imine–amide ion...