Figure 1
A view of the structure of (I), with the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. For clarity, H atoms have been omitted. Atoms labelled with the suffixes A, B, C and D are at the symmetry positions (−x, −y, 1 − z), (x, − y, + z), (−x, + y, − z) and (−x, 1 − y, 1 − z), respectively. |