Epidermal growth factor receptor (EGFR) and platelet-derived growth factor receptor (PDGFR) kinase inhibitor (IC50 values are 2.4 and 3 μM respectively). Stimulates microtubule polymerization and promotes neurite outgrowth > 17-fold over basal conditions in vitro. Also weakly inhibits protein kinase C (IC50 = 60 μM).