A cell-permeable, reversible, and ATP-competitive inhibitor of the tyrosine kinase activity of fibroblast growth factor receptor 1 (FGFR1; IC50 = 10-20 µM in the presence of 1 mM ATP). Also inhibits aFGF-induced tyrosine phosphorylation of ERK1 and ERK2 (IC50 = 10-20 µM). In contrast to…