5YQW:
reference: Structure and function of a novel periplasmic chitooligosaccharide-binding protein from marine Vibrio bacteria., Suginta W, Sritho N, Ranok A, Bulmer DM, Kitaoku Y, van den Berg B, Fukamizo T, J Biol Chem. 2018 Apr 6;293(14):5150-5159. doi: 10.1074/jbc.RA117.001012. Epub, 2018 Feb 14. PMID: 29444825

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