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Figure 1 The asymmetric unit of the title compound. Displacement ellipsoids are shown at the 50% probability level. H atoms have been omitted for clarity. [Symmetry codes: (i) −x, − + y, 1/2-z; (ii) −x, + y, 1/2-z; (iii) 1-x, − + y, 1/2-z; (iv) 1-x, + y, 1/2-z.] |