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View of two mixed macrocycles, 5, displaying the manner in which the diethyl ether molecules are bound on the inside (blue) and on the outside (orange) of the capsule. The O—H⋅⋅⋅O hydrogen bond distance for the diethyl ether molecules bound on the inside of capsule 9 is 2.69 Å, while that for those bound to the outside is 2.68 Å.
