Rab27 inhibitor (IC50 = 330 nM); inhibits Rab27a-JFC1 binding. Selectively inhibits neutrophil exocytosis, with no significant effect on other important innate immune responses including phagocytosis. Suppresses extracellular production of superoxide anion and cytochrome b plasma membrane expression. Also inhibits upregulation of adhesion molecules CD11b and CD66b. Displays in vivo anti-inflammatory activity. Purity 98%. MW (observed): 300.31