Description
A cell-permeable, selective, and reversible inhibitor of Syk (IC50 = 41 nM); prevents FcεRI-mediated 5-HT release in RBL-2H3 cells in vitro (IC50 = 460 nM) and inhibits passive cutaneous anaphylaxis reactions in mice (ID50 = 13.2 mg/kg, s.c.)