Protein kinase inhibitor; inhibits cyclin-dependent kinases (IC50 = 0.18 - 3.33 μM) and GSK-3β (IC50 = 0.19 μM). Inhibits CDK5- and GSK-3β-mediated tau phosphorylation, a process over-active in Alzheimer disease states. Also inhibits AMPK, LCK and SGK. Induces cell cycle arrest and inhibits cell proliferation.