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Figure 1 Crystal structure of the title compound with labeling and displacement ellipsoids drawn at the 50% probability level. Disordering is shown as full and open bonds. Symmetry codes: (i) − x, 4/3 − y, − z; (ii) − + y, − x + y, 4/3 − z; (iii) + x-y, + x, 4/3 − z. |