Compounds of the formula (I) in which X1, X2, X3, X4, R1, R2, R3, Q and Y have the meanings indicated in Claim 1, are inhibitors of c-Kit kinase, and can be employed for the treatment of cancer.
式(I)中X1、X2、X3、X4、R1、R2、R3、Q和Y的含义如权利要求书中所示,是c-Kit激酶的
抑制剂,可用于癌症的治疗。