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Figure 1 The structure of (I), showing the atomic numbering scheme. Non-H atoms are shown with 30% probability displacement ellipsoids. Symmetry codes: (i) 1 − x, 1 − y, 1 − z; (ii) 1 + x, − 1 + y, z; (iii) 2 − x, − y, 1 − z; (iv) 1 − x, 1 − y, 1 − z. |