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(a) Nested plot showing the protonated forms of the dipeptides RA, KV, and LN, which are irresolvable in the drift dimension. (b) The addition of 18-crown-6 ether (18C6) to the electrospray solution creates noncovalent complexes that shift the mobilities of the three peptides from that of the bare species (open white oval) enough that they are now mobility resolved under the same instrumental conditions. Figure reprinted from Reference 148.
