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The crystal and molecular structures of (E,E)-l,10-bis-(4-fluorophenyl)-3,8-dimethyl-deca-3,7-diene-1,10-dione have been determined by X-ray diffraction method. The crystal (C24 H24F2O2, Mr = 382.45) is of monoclinic, space group P21/C, a = 11.0392(5), b