Figure 1
The molecular structure of polymorph I. The upper molecule is located on an inversion centre and nonlabelled atoms are generated through the symmetry code (1 − x, 1 − y, 1 − z); the lower molecule is located on a binary axis and the symmetry code for the nonlabelled atoms is (1 − x, y, − z). Displacement ellipsoids are shown at the 20% probability level. The inset shows part of the crystal structure, including one stack of molecules. |