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Based on the structural features of fluometuron,an immunizing hapten was synthesized and conjugated to bovine serum albumin as an immunogen to prepare a polyclonal antibody.However,the resultant antibody indicated cross-reactivity with 6 structurally similar phenylurea herbicides,with binding activities (expressed by IC50 values) ranging from 1.67 μg/L to 42.71 μg/L.All 6 phenylurea herbicides contain a common moiety and three different substitutes.