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Figure 1 A view of the four molecules of (I) in a common orientation. Displacement ellipsoids are drawn at the 50% probability level. Hydrogen atoms have been omitted for clarity. Symmetry codes: i = − x, y, − z; ii = 1.5 − x, y, 1.5 − z; iii = − x, y, 1.5 − z; iv = 1.5 − x, y, − z. |