OD36 is a selective and potent RIPK2 inhibitor with an IC50 of 5.3 nM.OD36 inhibits ALK2 signaling and osteogenic differentiation (KD: 37 nM), and binds efficiently to the ALK2 kinase ATP pocket.

ALK2 (R206H):22 nM (IC50), ALK2:37 nM (Kd), ALK2:47 nM (IC50), RIPK2:5.3 nM (IC50)

OD36 shows activity against ALK1 (KD=90 nM).[2]
OD36 potently antagonizes mutant ALK2 signaling and osteogenic differentiation.[2]
OD36 (0.1-1 μM; 24 h; KS483 cells) efficiently inhibits BMP-6 (50 ng/mL)-induced p-Smad1/5.[2]
OD36 (0.5 μM) completely prevents the activation of Smad1/5 and the gene targets ID-1 and ID-3 in response to activin A in preincubated fibrodysplasia ossificans progressiva (FOP) endothelial colony-forming cells (ECFCs).[2]

OD36 (6.25 mg/kg; i.p.; once; C57BL/6 mice, muramyl dipeptide (MDP)-induced model of peritonitis) inhibited the recruitment of inflammatory cells to the peritoneum, specifically neutrophils, and to a lesser extent, lymphocytes. It decreased RIPK2-specific genes, as well as inflammatory cytokine and chemokine gene expression. OD36 alleviates inflammation in an acute peritonitis mice model.[3]