Currency exchange! Amphiphilic para-hexanoylcalix[4]arenes can form hydrophobic van der Waals nanocapsules (see picture) which are flexible enough to allow efficient guest exchange without destroying the crystal lattice. Purple: C (dibenzylketone), green: Cl(CHCl3), red: O, white: H.
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Ananchenko et al. (2006) studied this question.