本發明係有關於一種式(I)之香豆素化合物: 其中R1 、R2 、R3 、R4 、R5 、R6 及X如說明書所定義。本發明亦揭露一種以香豆素化合物治療癌症之醫藥組成物。Coumarin compounds of formula (I): wherein R1 , R2 , R3 , R4 , R5 , R6 , and X are defined herein. Also disclosed is a pharmaceutical composition for treating cancer with coumarin compounds.