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Figure 1 The atom numbering scheme for the centrosymmetric dimeric unit in the title compound with displacement ellipsoids drawn at the 30% probability level. Symmetry codes are: (i) −x + 1, −y, −z + 1; (ii) −x + 1, y − , −z − ; (iii) x, −y + , z + . The second set of hydrogen atoms on the 50% rotationally-disordered methyl groups (C8 and C9) are omitted. |