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In the chalcone title compound, C(18)H(17)BrO(4), the dihedral angle between the mean planes of the 2-bromo- and 3,4,5-trimethoxy-substituted benzene rings is 89.3 (1)°. The angles between the mean plane of the prop-2-en-1-one group and the 2-bromo-phenyl and 3,4,5-trimeth-oxy-phenyl ring planes are 59.7 (1) and 40.5 (8)°, respectively. While no classical hydrogen bonds are present, three weak inter-molecular C-H⋯O inter-actions and weak C-H⋯Br and C-H⋯Cg π-ring stacking inter-actions [C-H⋯Cg distance = 3.377 (2) Å] are observed, which contribute to the stability of crystal packing.
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