A potent, reversible, ATP-competitive, cell-permeable and selective inhibitor of Src-family tyrosine kinases that is >800 times more selective for the I338G mutant v-Src (IC50 = 1.5 nM) compared to wild-type v-Src (IC50 = 1 µM). Also inhibits wild-type Fyn (IC50 = 600 nM). Also available in…