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Figure 2 Part of the crystal structure of (I) showing intermolecular C—H⋯O hydrogen bonds (dotted lines), forming C(5) zigzag chains along the a axis. For clarity H atoms involved in the hydrogen bonds are shown. [Symmetry codes:(i)1/2 + x, 1/2 − y, 1 − z; (iii)1 + x, y, z; (iv)3/2 + x, 1/2 − y, 1 − z]. |