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Figure 1 . The structure of (I) showing the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as rods of arbitrary radius. [Symmetry Codes: (i) –x, y, –z + 1/2; (ii) –x, –y, –z + 1; (iii) x, –y, z – 1/2] |