2W4X:
reference: Structural insight into the mechanism of streptozotocin inhibition of O-GlcNAcase., He Y, Martinez-Fleites C, Bubb A, Gloster TM, Davies GJ, Carbohydr Res. 2008 Dec 13. PMID: 19217614

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