Compounds of formula (I)
1
in which R
1
, R
2
, R
3
and R
4
have the meanings given in the specification, are receptor tyrosine kinase inhibitors useful in the treatment of proliferative disorders, such as cancer.
式(I)1的化合物中,其中R1、R2、R3和R4具有规范中给出的含义,是用于治疗增殖性疾病,例如癌症的受体
酪氨酸激酶
抑制剂。