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FLT3/ITD-IN-2 (Compound 17) is a potent FLT3 internal tandem duplications (FLT3-ITD) inhibitor with IC50 values of 0.3, 0.4 and 1.0 nM against FLT3D835Y, FLT3 and FLT3-ITD, respectively. FLT3/ITD-IN-2 potently inhibits the phosphorylation of FLT3 and displays excellent antiproliferative activities against acute myeloid leukemia cell lines[1].

[1] Chen Y, et al. Discovery and structure - activity relationship exploration of pyrazolo[1,5-a]pyrimidine derivatives as potent FLT3-ITD inhibitors. Bioorg Med Chem. 2021 Oct 15;48:116422. DOI:10.1016/j.bmc.2021.116422