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Figure 5 Part of the crystal structure, showing the formation of (8) and (18) rings. Atoms marked with an ampersand (&), a hash symbol (#), dollar sign ($), or a star (*) are at the symmetry positions (1 − x, + y, 1.5 − z), (1 − x, − + y, 1.5 − z), (− + x, y, 1.5 − z), ( + x, y, 1.5 − z), respectively. |