1GZL:
reference: Short constrained peptides that inhibit HIV-1 entry., Sia SK, Carr PA, Cochran AG, Malashkevich VN, Kim PS, Proc Natl Acad Sci U S A. 2002 Nov 12;99(23):14664-9. Epub 2002 Nov 4. PMID: 12417739

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