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Figure 6 Part of the crystal structure, showing the formation of (32) rings. Atoms marked with a star (*), dollar sign ($), an ampersand (&), a hash symbol (#) are at the symmetry positions ( + x, − y, 1 − z), (1.5 − x, + y, z), (− + x, y, 1.5 − z), ( + x, y, 1.5 − z) respectively. |