SU6656 1mg. Orange solid. A potent Src family kinase inhibitor. Inhibits Src (IC50 = 280nM) as well as closely related kinases- Fyn (IC50 =170nM) Yes (IC50 =20nM) & Lyn (IC50 =130nM). Acts as a weak inhibitor of Lck (IC50 =688uM) and PDGF receptor kinase(