2XM2:
reference: Inhibition of a bacterial O-GlcNAcase homologue by lactone and lactam derivatives: structural, kinetic and thermodynamic analyses., He Y, Bubb AK, Stubbs KA, Gloster TM, Davies GJ, Amino Acids. 2011 Mar;40(3):829-39. Epub 2010 Aug 6. PMID: 20689974

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