NI-42

NI-42 is a potent, selective and orally active BRPF1 bromodomain inhibitor with IC50 of 7.9 nM, with excellent selectivity over nonclass IV BRDs; weakly inhibits BRPF2 (BRD1), BRPF3, BRD9 and BRD4 (BD1) with IC50 of 48, 260, 310 and 4500 nM respectively, and no activity for ATAD2A/2B (IC50>100 uM); shows a modest (GI50=1-10 uM) and selective inhibition of proliferation of certain cancer lines, particularly those lines exhibiting monocytic lineage differentiation; a novel, structurally orthogonal chemical probe for the BRPFs suitable for cellular and in vivo studies.