1ZHS:
reference: Crystal structures of the HIV-1 inhibitory cyanobacterial protein MVL free and bound to Man3GlcNAc2: structural basis for specificity and high-affinity binding to the core pentasaccharide from n-linked oligomannoside., Williams DC Jr, Lee JY, Cai M, Bewley CA, Clore GM, J Biol Chem 2005 Aug 12;280(32):29269-76. Epub 2005 Jun 3. PMID: 15937331

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