Cyclin-dependent kinase 2 (cdk2) inhibitor (reported IC50 values are 0.18 to 0.5 μM). Also inhibits cdk5 in sub-micromolar range (IC50 = 0.42 μM). Displays >7-fold selectivity for cdk2 and cdk5 over other cdks. Inhibits proliferation rat neonatal aortic smooth muscle cells and a range of tumor cells lines in vitro. Inhibits restenosis in a rat carotid artery injury model. Purity 98%. MW (observed): 400.47