Oxatub[4]arene: a smart macrocyclic receptor with multiple interconvertible cavities† †Electronic supplementary information (ESI) available: Experimental conditions and procedures, syntheses and compound characterizations, 1H, 13C and 2D NMR spectroscopic analyses, mass spectra, ITC titration data a

We report a smart macrocycle with four interconvertible cavities, which can select the best-fit cavity for a given guest.

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