Figure 1 The asymmetric unit of the title compound, with displacement ellipsoids drawn at the 30% probability level. H atoms and minor disordered sites have been omitted for clarity. [Symmetry codes: (i) 1-x, 2-y, 2-z; (ii) 1+x, 1+y, 1+z; (iii) -x, -y, -z; (iv) 1-x, 1-y, 1-z.]  [article HTML]