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Figure 2 Part of the crystal structure of (I) showing intermolecular C—H⋯O hydrogen bonds (dotted lines), forming C(6) zigzag chains along the b axis. For clarity H atoms involved in the hydrogen bonds are shown. [Symmetry codes:(iv)1 − x, −1/2 + y, 3/2 − z; (v)x, −1 + y, z; (vi)1 − x, −3/2 + y, 3/2 − z; (vii)x, −2 + y, z]. |