4ZLS:
reference: Structure-Based Design of Potent HIV-1 Protease Inhibitors with Modified P1-Biphenyl Ligands: Synthesis, Biological Evaluation, and Enzyme-Inhibitor X-ray Structural Studies., Ghosh AK, Yu X, Osswald HL, Agniswamy J, Wang YF, Amano M, Weber IT, Mitsuya H, J Med Chem. 2015 Jul 9;58(13):5334-43. doi: 10.1021/acs.jmedchem.5b00676. Epub, 2015 Jun 24. PMID: 26107245

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