Figure 1 A partial plot of the crystal structure of the title compound. Displacement ellipsoids are drawn at the 50% probability level. Symmetry codes: (i) -x + 1, y - [{1\over 2}], -z + [{1\over 2}]; (ii) -x + 1, -y + 1, -z + 1; (iii) x, -y + [{3\over 2}], z - [{1\over 2}]; (iv) -x + 2, -y + 1, -z + 1; (v) x + 1, -y + [{3\over 2}], z + [{1\over 2}]; (vi) x + 1, y, z; (vii) -x + 1, y + [{1\over 2}], -z + [{1\over 2}]; (viii) x, -y + [{3\over 2}], z + [{1\over 2}].  [article HTML]