6KXA:
reference: Topsy-turvy binding of negatively charged homogalacturonan oligosaccharides to galectin-3., Zheng Y, Su J, Miller MC, Geng J, Xu X, Zhang T, Mayzel M, Zhou Y, Mayo KH, Tai G, Glycobiology. 2020 Aug 17. pii: 5892985. doi: 10.1093/glycob/cwaa080. PMID: 32909036

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