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Figure 1 The molecular structure of the title compound, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level and H atoms have been omitted for clarity. [Symmetry codes: (i) 2 − x, 1 − y, −1 − z; (ii) 3 − x, 1 − y, 1 − z; (iii) −1 + x, y, z] |