Two isomeric host compounds 1 and 2, which are similar in shape and size to each other, afford crystalline host–guest inclusion complexes in different host:guest ratios with only an exception for Me2SO, a guest compound with strong hydrogen-bonding ability, to form isomorphic crystals of [1][Me2SO]2 and [2][Me2SO]2.
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Hayashi et al. (1994) studied this question.
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