The square channels of 2,4,6-tris(2-chloro-3-pyridinoxy)-1,3,5-triazine (![[similar]](http://www.rsc.org/images/entities/char_223c.gif)
4 Å) sustained by C–H
N and ClCl/ClN interactions tightly encapsulate small molecules in an aromatic enclosure, show reversible guest exchange, and the voids are stable up to 50% evacuation.
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