KRN383 analog is an analog of KRN383. KRN383 is an orally active Flt3 inhibitor that inhibits the autophosphorylation of Flt3 bearing internal tandem duplications (ITDs) and the Asp835Tyr (D835Y) point mutation with IC 50 values of < or =5.9 and 43 nM, respectively. KRN383 also inhibits the proliferation of the ITD-positive cell lines with IC 50 values of < or =2.9 nM. KRN383 can be used for the research of acute myeloid leukemia.