5NKJ:
reference: Structural Basis for a Bimodal Allosteric Mechanism of General Anesthetic Modulation in Pentameric Ligand-Gated Ion Channels., Fourati Z, Howard RJ, Heusser SA, Hu H, Ruza RR, Sauguet L, Lindahl E, Delarue M, Cell Rep. 2018 Apr 24;23(4):993-1004. doi: 10.1016/j.celrep.2018.03.108. PMID: 29694907

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