R-268712 is a potent and selective inhibitor of ALK5 with an IC50 of 2.5 nM.IC50 value: 2.5 nM [1]Target: ALK5in vitro: R-268712 is a novel and specific inhibitor of activin receptor-like kinase 5 (ALK5), a transforming growth factor β (TGF-β) type I receptor. R-268712 is a potent and selective inhibitor of ALK5 with an IC50 of 2.5 nM, an approximately 5000-fold more selectivity for ALK5 than p38 mitogen-activated protein kinase (MAPK). R-268712 is a weak inhibitor of p38 MAP kinase (IC50: 12.1 μM).[1]in vivo: Oral administration of R-268712 at doses of 1, 3 and 10 mg/kg also inhibited the development of renal fibrosis in a dose-dependent manner in a unilateral ureteral obstruction (UUO) model. [1]

[1]. Terashima H, et al. R-268712, an orally active transforming growth factor-β type I receptor inhibitor, prevents glomerular sclerosis in a Thy1 nephritis model. Eur J Pharmacol. 2014 Jul 5;734:60-6.