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The X-ray crystal structures of co-crystals involving C-methylcalix[4]resorcinarene 1 and exo-bidentate pyridines 2 are reported. The components assemble such that the calixarenes adopt a C 2v conformation and the pyridines serve as bifunctional hydrogen bond acceptors. In the case of linear bridging units, 4,4'-bipyridine 2a and 4,4'-dipyridyl butanedioate 2b, the assembly process yields...