Potent and selective, ATP-competitive glycogen synthase kinase-3 (GSK-3) inhibitor (IC50 values are 5, 83, 300, 320 and > 10 000 nM at GSK-3, CDK5/p25, CDK2/cyclin A, CDK1/cyclin B and other common kinases respectively). Maintains self-renewal and pluripotency in embryonic stem cells via activation of the Wnt signaling pathway in vitro.