3CX4:
reference: Oligosaccharide binding in Escherichia coli glycogen synthase., Sheng F, Yep A, Feng L, Preiss J, Geiger JH, Biochemistry. 2009 Oct 27;48(42):10089-97. PMID: 19761218

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