6I8N:
reference: Directed evolution of a designer enzyme featuring an unnatural catalytic amino acid., Mayer C, Dulson C, Reddem E, Thunnissen AM, Roelfes G, Angew Chem Int Ed Engl. 2018 Dec 21. doi: 10.1002/anie.201813499. PMID: 30575260

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