4IE9:
reference: Accounting for Conformational Variability in Protein-Ligand Docking with NMR-Guided Rescoring., Skjaerven L, Codutti L, Angelini A, Grimaldi M, Latek D, Monecke P, Dreyer MK, Carlomagno T, J Am Chem Soc. 2013 Apr 17;135(15):5819-27. doi: 10.1021/ja4007468. Epub 2013 Apr, 8. PMID: 23565800

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