Mmm, doughnuts! Six calix[4]arene molecules self-assemble into a large hexameric torus-shaped structure through hydrogen bonds (see picture; Br yellow, O red, C gray, H white). The doughnut assembly shows a noteworthy structural similarity to cucurbit[6]uril in the solid state and therefore may be viewed as a noncovalent analogue.
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McKinlay et al. (2007) studied this question.
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