1CZQ:
reference: Inhibiting HIV-1 entry: discovery of D-peptide inhibitors that target the gp41 coiled-coil pocket., Eckert DM, Malashkevich VN, Hong LH, Carr PA, Kim PS, Cell 1999 Oct 1;99(1):103-15. PMID: 10520998

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