The present invention includes a method of reducing or inhibiting the kinase activity of C-KIT mutant tyrosine kinase activity in a cell or a subject, and the use of such compound for treating mutant C-KIT driven cell proliferative disorder(s) in a subject related to using a compound of the present invention: or pharmaceutically acceptable salt thereof.本發明包括降低或抑制細胞或對象中C-KIT突變體酪氨酸激酶活性的方法,以及與利用本發明化合物或其藥學上可接受的鹽相關的此類化合物在治療對象中突變型C-KIT驅動細胞增殖性疾病中的應用。