6WIA:
reference: Structural and Kinetic Evidence of Aging after Organophosphate Inhibition of Human Cathepsin A., Bouknight KD, Jurkouich KM, Compton JR, Khavrutskii IV, Guelta MA, Harvey SP, Legler PM, Biochem Pharmacol. 2020 Apr 16:113980. doi: 10.1016/j.bcp.2020.113980. PMID: 32305437

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