4CDR:
reference: Bisubstrate UDP-peptide conjugates as human O-GlcNAc transferase inhibitors., Borodkin VS, Schimpl M, Gundogdu M, Rafie K, Dorfmueller HC, Robinson DA, van Aalten DM, Biochem J. 2013 Nov 21. PMID: 24256146

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