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