1ACL:
reference: Quaternary ligand binding to aromatic residues in the active-site gorge of acetylcholinesterase., Harel M, Schalk I, Ehret-Sabatier L, Bouet F, Goeldner M, Hirth C, Axelsen PH, Silman I, Sussman JL, Proc Natl Acad Sci U S A 1993 Oct 1;90(19):9031-5. PMID: 8415649

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