The title compound, C(21)H(22)FNO(4), is an isomer of flumorph (systematic name 4-[3-(3,4-dimethoxyphenyl)-3-(4-fluorophenyl)-1-oxo-2-propenyl]morpholine), which was developed by Shenyang research institute of chemical industry and used as fungicide. The mol-ecule adopts a Z configuration about the C=C double bond. The dihedral angle between the two benzene rings is 73.45 (11)°.