PROBLEM TO BE SOLVED: To provide compounds that are useful for treating thyroid cancer and the like.SOLUTION: A compound has a structure represented by the formula (I). (R1 is a furanyl group, pyridinyl group, or the like; R2 is H, alkoxy, or the like; R3 to R7 are each independently H, alkyl, aminocarbonyl, or the like, provided that at least one of R3 and R7 is not H; and X is O or S.)SELECTED DRAWING: None【課題】甲状腺がん等の処置に有用な化合物の提供。【解決手段】式(I)で表される構造を有する化合物。(R1はフラニル基、ピリジニル基等;R2はH、アルコキシ等;R3~R7は各々独立にH、アルキル、アミノカルボニル等;但し、R3又はR7の少なくとも一方はHでない;XはO又はS)【選択図】なし