2HS2:
reference: Ultra-high Resolution Crystal Structure of HIV-1 Protease Mutant Reveals Two Binding Sites for Clinical Inhibitor TMC114., Kovalevsky AY, Liu F, Leshchenko S, Ghosh AK, Louis JM, Harrison RW, Weber IT, J Mol Biol. 2006 Oct 13;363(1):161-73. Epub 2006 Aug 4. PMID: 16962136

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