2GPL:
reference: TMC-95-Based Inhibitor Design Provides Evidence for the Catalytic Versatility of the Proteasome., Groll M, Gotz M, Kaiser M, Weyher E, Moroder L, Chem Biol. 2006 Jun;13(6):607-14. PMID: 16793518

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