6VOE:
reference: Structure-Based Design of Highly Potent HIV-1 Protease Inhibitors Containing New Tricyclic Ring P2-Ligands: Design, Synthesis, Biological, and X-ray Structural Studies., Ghosh AK, Kovela S, Osswald HL, Amano M, Aoki M, Agniswamy J, Wang YF, Weber IT, Mitsuya H, J Med Chem. 2020 Apr 29. doi: 10.1021/acs.jmedchem.0c00202. PMID: 32348139

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