2QNQ:
reference: Structure-Guided Design of C2-Symmetric HIV-1 Protease Inhibitors Based on a Pyrrolidine Scaffold., Blum A, Bottcher J, Heine A, Klebe G, Diederich WE, J Med Chem. 2008 Apr 10;51(7):2078-87. Epub 2008 Mar 19. PMID: 18348517

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