4BQN:
reference: Structural insights into WcbI, a novel polysaccharide-biosynthesis enzyme., Vivoli M, Ayres E, Beaumont E, Isupov MN, Harmer NJ, IUCrJ. 2013 Oct 18;1(Pt 1):28-38. doi: 10.1107/S205225251302695X. eCollection, 2014 Jan 1. PMID: 25075317

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