5VOJ:
reference: Hepatitis C Virus NS3/4A Protease Inhibitors Incorporating Flexible P2 Quinoxalines Target Drug Resistant Viral Variants., Matthew AN, Zephyr J, Hill CJ, Jahangir M, Newton A, Petropoulos CJ, Huang W, Kurt-Yilmaz N, Schiffer CA, Ali A, J Med Chem. 2017 Jul 13;60(13):5699-5716. doi: 10.1021/acs.jmedchem.7b00426. Epub, 2017 Jun 19. PMID: 28594175

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