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Two large and five small rings interlock to give the [7]catenane depicted on the right. Every potential π-donor and π-acceptor recognition site within this molecule is utilized. Only the application of high pressure (12 kbar) made possible the efficient assembly of this exotic molecular compound, for which a solid-state structure was obtained by X-ray crystallography.
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Amabilino et al. (1997) studied this question.
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