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N-(5-Aryl-1,3,4-thiadiazol-2-yl)-N?-((E)-styryl)ureas 4 a~4 i were designed and synthesized as antitumor agents, and their structures were characterized by IR, 1 H NMR, 13 C NMR,MS and elemental analysis. The single crystal of compound 4 a, C17 H13 FN4 OS