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Figure 1 Molecular structure of (I); ellipsoids are drawn at the 30% probability level, and H atoms as spheres of arbitrary radius. The 15-crown-5 is disordered about a center of inversion, only one orientation is shown for reasons of clarity. Dashed lines denote the water⋯crown-ether hydrogen bonds. Unlabelled atoms are related by the symmetry operation −x + 2, −y + 1, −z + 2. |