4JEC:
reference: Joint X-ray/Neutron Crystallographic Study of HIV-1 Protease with Clinical Inhibitor Amprenavir: Insights for Drug Design., Weber IT, Waltman MJ, Mustyakimov M, Blakeley MP, Keen DA, Ghosh AK, Langan P, Kovalevsky AY, J Med Chem. 2013 Jun 28. PMID: 23772563

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