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Figure 1 The asymmetric unit of the title compound. Displacement ellipsoids are drawn at the 50% probability level. H atoms are omitted for clarity. [Symmetry codes: (i) 1 − x, 2 − y, 1 − z; (ii) 1 − x, 2 − y, −z; (iii) −1 + x,1.5 − y, − + z; (iv) −1 + x, y, z; (v) x, y, 1 + z; (vi) 2 − x, 2 − y, 1 − z.] |