2GVF:
reference: P2-P4 macrocyclic inhibitors of hepatitis C virus NS3-4A serine protease., Arasappan A, Njoroge FG, Chen KX, Venkatraman S, Parekh TN, Gu H, Pichardo J, Butkiewicz N, Prongay A, Madison V, Girijavallabhan V, Bioorg Med Chem Lett. 2006 Aug 1;16(15):3960-5. Epub 2006 May 30. PMID: 16730985

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