3I6M:
reference: Probing Torpedo californica Acetylcholinesterase Catalytic Gorge with Two Novel Bis-functional Galanthamine Derivatives., Bartolucci C, Haller LA, Jordis U, Fels G, Lamba D, J Med Chem. 2009 Dec 21. PMID: 20025280

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