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Top and side views of the solid-state tubular assemblies of 6a (a) and 1a (b). (a) Three molecules of 6a are shown. The solvent molecules (pyridine, purple; THF, green) in the macrocyclic cavity are also shown. (b) Three molecules of 1a are shown. The solvent molecules (DMF, green) in the cavity are also shown. For clarity, all H atoms are removed.
