The present invention provides compounds of formula (I) which are potent inhibitors of Chk1 and have the structural formula below:(I), wherein R1, R2, R3, R4, and R5are as defined herein. Pharmaceutical compositions comprising the compounds, uses thereof and their preparation process are also provided.本發明提供一種式(I)化合物,其係檢測點激酶1 (Chk1)之有效抑制劑,並具有以下結構式:, 其中R1、R2、R3、R4及R5係如本文中所定義。本發明亦提供包含此等化合物之醫藥組合物、此等化合物之用途及此等化合物之製造方法。