CDKI-73 (LS-007) is a potent CDK inhibitor in vitro with IC50 of 8.17 nM, 3.27 nM, 8.18 nM, and 5.78 nM for CDK1, CDK2, CDK4, and CDK9, respectively. CDKI-73 induces apoptosis in cancer cells. CDKI-73 is an orally bioavailable and highly efficacious CDK9 inhibitor against acute myeloid leukemia.