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(a) Stack plot of 1H NMR spectra of SQS‐1 (5 mM) upon addition of TBACl (0–30 equiv.) in DMSO‐d6 at 25 °C. (b) Changes in the chemical shifts observed for the squaramide N−H and methylene protons as a function of increasing Cl− concentration, and the corresponding fit to a 1 : 1 binding model.
