Potent, ATP-competitive VEGFR, PDGFRβ and KIT inhibitor (Ki values are 2, 9, 17, 8 and 4 nM for VEGFR -1, -2, -3, PDGFRβ and KIT respectively). Also inhibits cellular receptor phosphorylation of FLT3, RET and CSF-1R. Exhibits antiangiogenic and antitumor activity in multiple xenograft models.