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Some thiazolamide derivatives containing diphenyl ether moiety were designed, synthesized, and studied for their antifungal activity and cell cytotoxicity. Of these, several compounds II possessed excellent activity against Rhizoctonia solani, which was better than that of boscalid and comparable to thifluzamide. Besides, the cytotoxicity test showed that the optimal compound IIf had lower cytotoxicity than thifluzamide in general. Further, molecular docking could give a reasonable explanation for the high activity of the target compounds. The above results indicated that thiazolamide derivatives containing diphenyl ether moiety are valuable for in-depth study to obtain high-efficiency and low-toxicity green pesticides. A series of new thiazolamide derivatives containing diphenyl ether moiety were designed and synthesized. The biological evaluation indicated optimal compound IIf displayed not only high fungicidal activity but also lower cytotoxicity. Besides, molecular docking gave a reasonable explanation for the high activity of the target compounds. [ABSTRACT FROM AUTHOR]