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Figure 1 A partial packing diagram of the title compound, with displacement ellipsoids drawn at the 30% probability level. Only the major component of the disordered ethyl group is shown. Symmetry codes: (i) −x, −y, 1 − z; (ii) 1 − x, 1 − y, 2 − z; (iii) 2 − x, 1 − y, 1 − z. |