SD-208 is a potent, orally active ATP-competitive transforming growth factor-β receptor 1 (TGF-βRI) inhibitor (IC50= 49 nM); displays > 100-fold and > 17-fold selectivity over TGF-βRII and other common kinases respectively.
(+)-ITD-1 is a resolved enantiomer of ITD-1 that possesses a greater than 2-fold increase in TGF-β inhibition (~400 nM) and 1.3-fold increase in cardiogenesis compared to the racemic ITD-1.
LDN193189 HCl (DM-3189) is the hydrochloride salt of LDN193189, which is a selective BMP signaling inhibitor, and inhibits the transcriptional activity of the BMP type I receptors ALK2 and ALK3 with IC50 of 5 nM and 30 nM in C2C12 cell lines, respectively, 200-fold selectivity for BMP versus TGF-β.