A 5-methoxytryptophan and its derivatives are disclosed, wherein the 5-methoxytryptophan and its derivatives are represented by the following formula (I): wherein R1, R2, R3, R4, R5, and n are defined in the specification. In addition, the present invention also provides novel used of the 5-methoxytryptophan and its derivatives for treating inflammatory-related disease and cancers.本發明揭露一種5-甲氧基色胺酸及其衍生物，其中5-甲氧基色胺酸及其衍生如下式(I)所示：其中，R1、R2、R3、R4、R5、及n如說明書所定義。此外，本發明亦提供5-甲氧基色胺酸及其衍生物用於治療發炎類相關疾病及癌症之新穎用途。
