A potent inhibitor of Aurora kinases (IC50s = 15, 25 and 19 nM for Aurora A, B, and C, respectively); also inhibits FLT3 as well as the constitutively active FLT3-ITD form (IC50s = 1.2 and 4.9 nM, respectively); orally bioavailable, inhibiting the growth of SW620 colon carcinoma xenografts in mice.