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Figure 3 Part of the crystal structure of (I), showing the C⋯C and C—H⋯C interactions (dashed lines) connecting molecules among layers. H-atoms not involved into hydrogen bonding have been omitted for clarity. Symmetry codes: (iii) 1 − x, 2 − y, 1 − z; (iv) 1 − x, 1 − y, 2 − z; (v) −x, 1 − y, 2 − z. |