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Figure 1 A section of the structure of (I) showing the centrosymmetric SBU with the edge-sharing distorted CuO6 octahedra. Displacement ellipsoids are drawn at the 50% probability level. Atoms labelled a, b, c are symmetry-related. Symmetry codes: (a = − x, − + y, − z; (b = − x, + y, − z; (c = − x, − y, 1 − z). |