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Figure 1 The asymmetric unit of the title compound. Displacement ellipsoids are drawn at the 30% probability level. H atoms have been omitted for clarity. [Symmetry codes: (i) 1 − x, 1 − y, 1 − z; (ii) 1 − x, 2 − y, −z; (iii) 2 − x, 1 − y, −z; (iv) 2 − x, 2 − y, −z.] |