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Figure 1 Part of the structure of the title compound, showing the atom-numbering scheme and with displacement ellipsoids drawn at the 35% probability level. All H atoms have been omitted for clarity. Symmetry codes: (i) −x, y, −z + ; (ii) −x + 1, y, −z + ; (iii) x − 1, y, z; (iv) x + 1, y, z. |