Figure 1 The molecular structure of the title compound with thermal ellipsoids at the 30% probability level. All H atoms were removed for clarity. Symmetry codes: (i) x, -y + [{1\over 2}], -z + [{1\over 2}]; (ii) -x, -y + [{1\over 2}], z; (iii) -x, y, -z + [{1\over 2}]  [article HTML]