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Figure 1 a view of the structure with the independent atoms drawn in full 50% displacement ellipsoids. The symmetry related part, in dashed ellipsoids and bonds. Hydrogen interactions not shown, for clarity. Symmetry codes: (i) -x + 1, -y, -z + 1; (ii) -x, -y + 1, -z + 1; (iii) -x + 1, -y + 1, -z + 1; (iv) -x + 1, y + , -z + ; (v) x, -y + , z + .