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Figure 1 . A view of the molecule of (I) with displacement ellipsoids drawn at the 30% probability level. H atoms have been omitted. [Symmetry codes: (i) −x, −y, −z; (ii)x-y, x, −z; (iii) −x + y, −x, z; (iv) −y, x-y, z; (v) y, −x + y, −z; (vi) −x + ,-y + , −z + ] |