Potent inhibitor of FLT3 receptor tyrosine kinase (IC50 = 42 nM) that displays selectivity over a range of other kinases. Exhibits antiproliferative effects on MV4-11 cells, a human acute myelogenous leukemia cell line expressing a constitutively active mutant FLT3 (IC50 = 340 nM). Purity 99%. MW (observed): 360.43