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Figure 1 The fragment structure of (I) is shown with the atomic numbering scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as small spheres of arbitrary radii. [Symmetry codes: (i) x + 1, y, z; (ii) x + , −y + , z + ; (iii) −x + , y + , −z + ; (iv) x − , −y + , z − ; (v) x − 1, y, z; (vi) −x + , y − , −z + ] |