4ZSU:
reference: Variants of Phosphotriesterase for the Enhanced Detoxification of the Chemical Warfare Agent VR., Bigley AN, Mabanglo MF, Harvey SP, Raushel FM, Biochemistry. 2015 Aug 25. PMID: 26274608

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