An inhibitor of Src family kinases, including Src, LCK, Lyn, and Hck (IC50s = 9, 50 = 3,000 nM) and PKC (IC50 = >33 μM); inhibits growth of Ph+ K-562 and Meg-01 myeloid leukemia cells (IC50s = 0.1-0.3 and 0.1 μM, respectively), but not Ph- TF-1 and HEL cells; induces apoptosis in K-562 cells in a concentration-dependent manner; inhibits differentiation of murine embryonic stem cells while maintaining pluripotency at 300 nM; reduces the total number of AML cells, as well as AML stem cells, in the bone marrow and spleen of human patient-derived AML mouse xenograft models at 30 mg/kg twice daily