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Figure 1 Coordination enviroment in the title compound showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 50% probability level and the H atoms attached to C are omitted for clarity. [Symmetry code: (i)- + x, − y, + z (ii) 1 + x, y, z (iii) −1 + x, y, z (iv)1/2 + x, − y, − + z] |