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Figure 1 The molecular structure of the title compound with displacement ellipsoids drawn at the 30% probability level. H atoms are omitted for clarity. Symmetry codes: (i) 0.5 − x, 0.5 − y, −z; (ii) 0.5 − x, 0.5 + y, 0.5 − z; (iii) x, −y, −0.5 + z. |