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Figure 9 The molecular components of (4) and the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. The atoms marked `a' are at the symmetry position (1 - x, 1 - y, 1 - z). The methyl groups that contain C52 and C72 have occupancies 0.679 (5) and 0.321 (5), respectively.

© International Union of Crystallography 2003