Molecular recognition in the gas phase ligand switching reactions of the proton bound dimer of sarcosine and glycylglycine.Part 35 of the series “Gas Phase Ion Chemistry of Biomolecules”. Part 34: A. K. Vrkic, and R. A. J. O’Hair, Gas phase reactions of trimethylborate with the [M-H]– ions of nucleotides and their non-covalent homo and heterodimer complexes, Aust. J. Chem., in press.Electronic supplementary information (ESI) available: heats of formation of adducts and PM3-optimized adduct structures. See http://www.rsc.org/suppdata/ob/b2/b209848b/