A potent inhibitor of kinase insert domain-containing receptor [KDR/vascular endothelial growth factor receptor (VEGFR) 2] tyrosine kinase activity (IC₅₀ = 40 nM).  This compound also inhibits fms-like tyrosine kinase 4 (VEGFR3, IC₅₀ = 110 nM) and epidermal growth factor receptor (EGFR/HER1, IC₅₀ = 500 nM) but shows selectivity relating to a range of other tyrosine and serine-threonine kinases.