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Figure 1 . The fragment of the structure of the title compound, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 30% probability level and H atoms are shown as small circles of arbitrary radii. Symmetry codes: (i) 1 − x, −y, 2 − z; (ii) 1 − x, 1 − y, 2 − z; (iii) −x, 1 − y, 2 − z; (iv) 1 − x, −y, 1 − z; (v) 2 − x, 1 − y, 1 − z. |