3IOH:
reference: Structural and mechanistic basis for a new mode of glycosyltransferase inhibition., Pesnot T, Jorgensen R, Palcic MM, Wagner GK, Nat Chem Biol. 2010 May;6(5):321-3. Epub 2010 Apr 4. PMID: 20364127

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