Potent, ATP-competitive dual cdc7/cdk9 inhibitor (IC50 values are 10 and 34 nM respectively) that prevents initiation of DNA replication. Inhibits cell proliferation in a variety of human cell lines (IC50 ~ 0.86 - 5.87 μM) and induces apoptosis in a p53-independent manner in vivo. Also inhibits mitogen-activated protein kinase-activated protein kinase-2 (MK-2) (IC50 = 171 nM).