BET-IN-20 (compound 10) is an inhibitor of BRD4 BD1 (IC 50 =1.9 nM) with anticancer activity. BET-IN-20 can promote acute myeloid leukemia (AML) cell apoptosis and arrest the cell cycle in the G0/G1 phase. BET-IN-20 also inhibits c-Myc and CDK6 and enhances PARP cleavage.