6O5A:
reference: Highly Drug-Resistant HIV-1 Protease Mutant PRS17 Shows Enhanced Binding to Substrate Analogues., Agniswamy J, Kneller DW, Brothers R, Wang YF, Harrison RW, Weber IT, ACS Omega. 2019 May 31;4(5):8707-8719. doi: 10.1021/acsomega.9b00683. Epub 2019, May 17. PMID: 31172041

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