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Part of the crystal structure showing the ladder-like array formed by π–π stacking interactions and weak C—H···O hydrogen bonds (dashed lines) [Symmetry codes: (i) x + 3/2, -y + 1/2, z + 1/2; (ii) x - 3/2, -y + 1/2, z - 1/2; (iii) -x + 1, -y + 1, -z + 2].
