6DJ5:
reference: Drug Resistance Mutation L76V Alters Nonpolar Interactions at the Flap-Core Interface of HIV-1 Protease., Wong-Sam A, Wang YF, Zhang Y, Ghosh AK, Harrison RW, Weber IT, ACS Omega. 2018 Sep 30;3(9):12132-12140. doi: 10.1021/acsomega.8b01683. Epub 2018, Sep 27. PMID: 30288468

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