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