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One strategy for solving the phytotoxicity of herbicides is to apply herbicide safeners that can efficiently alleviate the injuries of agricultural crops caused by herbicides. When metolachlor, a chloroacetamide herbicide, is applied with paddy rice, for example, the mechanisms associated with metolachlor and its residue negatively impact on the growth and yields of rice. To identify novel high-activity herbicide safener candidates for metolachlor, a series of (E)-4-(2-substituted hydrazinyl)-6-chloro-2-phenyl pyrimidines were synthesized