Formula (I) compound and its pharmaceutically acceptable salt are disclosed as the inhibitor of cFMS, and it is suitable for treatment bone related disease, cancer, autoimmune disorder, inflammatory disease, cardiovascular disease and pain, wherein R1, R2, R3, R4 and R5 have the meaning gone out given in specification.披露了式(I)化合物和其藥學上可接受的鹽爲cFMS的抑制劑,並且適用於治療骨相關疾病、癌症、自身免疫病症、炎性疾病、心血管疾病以及疼痛,其中R1、R2、R3、R4以及R5具有說明書中所給出的含義。