4GX7:
reference: Vibrio cholerae Cytolysin Recognizes the Heptasaccharide Core of Complex N-Glycans with Nanomolar Affinity., Levan S, De S, Olson R, J Mol Biol. 2012 Dec 28. pii: S0022-2836(12)00949-7. doi:, 10.1016/j.jmb.2012.12.016. PMID: 23274141

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