2KQO:
reference: A 3D-structural model of unsulfated chondroitin from high-field NMR: 4-sulfation has little effect on backbone conformation., Sattelle BM, Shakeri J, Roberts IS, Almond A, Carbohydr Res. 2009 Nov 23. PMID: 20022001

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