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Figure 1 Part of the polymeric structure of the title compound, showing the atomic numbering scheme. Displacement ellipsoids are drawn at the 30% probability level. Symmetry codes: (i) 1-x, y, 3/2-z; (ii) 3/2-x, + y, 3/1-z; (iii) x − , 1/2-y, z − ; (iv) −x, y, 1/2-z. |