1MBB:
reference: (E)-enolbutyryl-UDP-N-acetylglucosamine as a mechanistic probe of UDP-N-acetylenolpyruvylglucosamine reductase (MurB)., Lees WJ, Benson TE, Hogle JM, Walsh CT, Biochemistry 1996 Feb 6;35(5):1342-51. PMID: 8634262

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