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Figure 1 . View of the title compound with the atom labeling scheme. Ellipsoids are drawn at the 30% probability level. H atoms have been omitted for clarity·[Symmetry codes: (i) −x + 1, y, −z + ; (ii) −x + 1, −y + 2, −z; (iii) x, −y + 2, z + ; (iv) x, −y+2, z-1/2]. |