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Figure 1 Molecular structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. Atoms generated through the twofold rotation axis are represented by atoms ending with 'i′. Hydrogen atoms have been omitted for clarity. Dashed lines denote the minor disordered atoms. Symmetry transformations used to generate equivalent atoms: 2 − x, −y, 2 − z. |