The present invention relates to a kinase inhibitor, comprising a compound of Formula I or a pharmaceutically acceptable salt, solvate, ester, acid, metabolite or prodrug thereof. The present invention also relates to a pharmaceutical composition comprising the kinase inhibitor, and to uses and methods for using these compounds and compositions to inhibit the activity of wild-type FLT3, mutant FLT3-ITD, PDGFRα and/or PDGFRβ kinase in a cell or a subject, as well as uses and methods of these compounds and compositions to preventing or treating kinase-associated conditions in a subject.
