5OXG:
reference: Structural basis for the potent and selective binding of LDN-212854 to the BMP receptor kinase ALK2., Williams E, Bullock AN, Bone. 2017 Sep 12. pii: S8756-3282(17)30340-X. doi: 10.1016/j.bone.2017.09.004. PMID: 28918311

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).