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Figure 1 A portion of (1), showing the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. C-bound H atoms omitted for clarity. [Symmetry codes: (i) x, −y + , z-1/2; (ii) x, −y + , z − ; (iii) x, −y + , z+1/2; (iv) x, −y + , z+1/2; (v) x, y + 1, z; (vi) x, y − 1, z]. |