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Figure 1 A view of the asymmetric unit and some symmetry-related atoms of (I) showing 60% probability displacement ellipsoids. The various bonds lengths are distinguished by colours and style: indigo-thick up to 2.514 Å, yellow-thick from 2.707 Å to 3.042 Å, yellow-thin-dashed for 3.168 Å. [Symmetry codes: (i) x, y, −1 + z; (ii) − x, 1 − y, − + z; (iii) − x, 1 − y, − + z; (iv) − − x, 1 − y, − + z; (v) 1 − x, y, −1 + z; (vi) 1 + x, 1 + y, −1 + z; (vii) −x, 1 + y, −1 + z; (viii) x, 1 + y, −1 + z; (ix) + x, 1 − y, − + z; (x) − x, 1 − y, − + z] |