4K8B:
reference: Ligand bioactive conformation plays a critical role in the design of drugs that target the hepatitis C virus NS3 protease., Laplante SR, Nar H, Lemke CT, Jakalian A, Aubry N, Kawai SH, J Med Chem. 2014 Mar 13;57(5):1777-89. doi: 10.1021/jm401338c. Epub 2013 Nov 8. PMID: 24144444

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