AS-99 free base

AS-99 is a first-in-class, potent, and selective ASH1L histone methyltransferase inhibitor (IC50= 0.79 μM, Kd= 0.89 μM) with anti-leukemic activity, blocking cell proliferation, inducing apoptosis and differentiation, downregulating MLL fusion target genes, and reducing the leukemia burden in vivo[1].