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Figure 1 . View of the basic structural motif in the title compound with the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. Symmetry codes: (i) x, y, z-1; (ii) 1-y, 1+x-y, 1+z; (iii) −y, x-y, 1+z; (iv) 1-y, x-y, 1+z. |