Supramolecular tetrameric aggregates of four molecules of 7-deaza-2′-deoxyxanthosine are stabilized by unconventional C−H⋅⋅⋅O hydrogen bonds. In the solid state the tetramers stack to form a nanotube (see picture), in the center of which water molecules are found which are also stacked.
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Seela et al. (2002) studied this question.
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