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Figure 1 The structure of (I), showing the atomic numbering scheme. Displacement ellipsoids are drawn at the 20% probability level. H atoms and also some C atoms have been omitted for the sake of clarity. Symmetry code: (i) 1-x, 2-y, 1-z; (ii) x, 0.5-y, z − 0.5; (iii) 1-x, 1-y, 1-z; (iv) 1-x, 0.5 + y, 1.5-z. |