4J0M:
reference: Structural basis for differential recognition of brassinolide by its receptors., She J, Han Z, Zhou B, Chai J, Protein Cell. 2013 Jun;4(6):475-82. doi: 10.1007/s13238-013-3027-8. Epub 2013 May, 25. PMID: 23709366

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