Dorsomorphin 2HCl (CAS 1219168-18-9) is a small-molecule inhibitor targeting BMP signaling through selective blockade of BMP type I receptors ALK2 ALK3 and ALK6 It prevents phosphorylation of downstream effectors SMAD1/5/8 with an IC50 of approximately 0 47 mM Originally identified by zebrafish phenotypic screening as a disruptor of embryonic dorsoventral patterning Dorsomorphin has been employed to dissect BMP-regulated pathways in iron homeostasis significantly affecting hepcidin expression and iron metabolism in vitro and in vivo It is widely utilized in mechanistic studies of BMP function and signaling regulation