It is active against a number of FLT3/ITD resistance mutations including FLT3/ITD/A627T, FLT3/ITD/N676D, FLT3/ITD/F691L, with IC50s of 0.1nM, 2.3nM, 14.6nM, respectively. It is also active against FLT3 kinase domain (FLT3/KD) resistance mutations, with IC50s against FLT3/D835A and FLT3/840GS of 5.3nM and 9.6nM, respectively.