AMG-47a is a potent and orally active lymphocyte-specific protein tyrosine kinase (Lck) inhibitor, with an IC50 of 0.2 nM. AMG-47a also inhibits VEGF2, p38α, Jak3 and MLR and IL-2 with IC50s of 1 nM, 3 nM, 72 nM, 30 nM and 21 nM, respectively. AMG-47a has anti-inflammatory activity.