3QAA:
reference: Design of substituted bis-Tetrahydrofuran (bis-THF)-derived Potent HIV-1 Protease Inhibitors, Protein-ligand X-ray Structure, and Convenient Syntheses of bis-THF and Substituted bis-THF Ligands., Ghosh AK, Martyr CD, Steffey M, Wang YF, Agniswamy J, Amano M, Weber IT, Mitsuya H, ACS Med Chem Lett. 2011 Apr 14;2(4):298-302. PMID: 22509432

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