Potent, ATP-competitive inhibitor of cyclin-dependent kinase (cdk) and casein kinase 1 (CK1) (IC50 values are 220, 80 and 14 nM for cdk1/cyclin B, cdk5/p25 and CK1 respectively). Selective over GSK-3 αβ (IC50= 4.1 μM). Also shown to inhibit amyloid-β production in N2A-APP695 cells.