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Figure 1 The asymmetric unit of the title compound (displacement ellipsoids drawn at the 35% probability level). Unlabeled atoms are related to the labelled atoms by symmetry operators (symmetry codes: A = −x, 1 − y, 1 − z; B = 1 − x, −y, 2 − z; C = x − 1, y, z; D = −x, −y, 2 − z). |