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Figure 1 The asymmetric unit of the title compound. Displacement ellipsoids are drawn at the 30% probability level. H atoms are omitted for clarity. [Symmetry codes: (i) x, y + 1, z; (ii) −x + 1, y − , −z + ; (iii) x − 1, y − 1, z; (iv) −x, y + , −z + .] |