3VTP:
reference: The M-T hook structure is critical for design of HIV-1 fusion inhibitors., Chong H, Yao X, Sun J, Qiu Z, Zhang M, Waltersperger S, Wang M, Cui S, He Y, J Biol Chem. 2012 Oct 5;287(41):34558-68. doi: 10.1074/jbc.M112.390393. Epub 2012, Aug 9. PMID: 22879603

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