5KE4:
reference: The twin drug approach for novel nicotinic acetylcholine receptor ligands., Tomassoli I, Gundisch D, Bioorg Med Chem. 2015 Aug 1;23(15):4375-89. doi: 10.1016/j.bmc.2015.06.034. Epub , 2015 Jun 20. PMID: 26142318

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