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Figure 1 A view of the selected unit of (I), showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level. Hydrogen atoms have been omitted for clarity. [Symmetry codes: (i) x − 1, y, z; (ii) −x + 1, −y + 1, −z + 1; (iii) −x, −y + 1, −z + 1; (iv) x + 1, y, z.] |