An inhibitor of native (IC50 = 0.37 nM) and mutant Bcr-Abl; inhibits the tyrosine kinase inhibitor-resistant mutant Bcr-AblT315I (IC50 = 2 nM), as well as Bcr-AblQ252H, Bcr-AblY253F, Bcr-AblM351T, and Bcr-AblH396P mutants (IC50s = 0.44, 0.3, 0.3, and 0.34 nM, respectively); selective for Bcr-Abl and these mutants over the insulin receptor, IGF-1R, Aurora A kinase, and Cdk2/cyclin E but does inhibit c-Src, VEGFR2, FGFR1, and PDGFRα (IC50s = 5.4, 1.5, 2.2, and 1.1 nM, respectively); inhibits proliferation of Ba/F3 cells expressing native (IC50 = 0.5 nM) or mutant Bcr-Abl (IC50s = 0.5-36 nM); reduces tumor growth in a Ba/F3 Bcr-AblT315I mouse xenograft model at 10-30 mg/kg