1HXB:
reference: Novel binding mode of highly potent HIV-proteinase inhibitors incorporating the (R)-hydroxyethylamine isostere., Krohn A, Redshaw S, Ritchie JC, Graves BJ, Hatada MH, J Med Chem 1991 Nov;34(11):3340-2. PMID: 1956054

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