3O7K:
reference: Structural and Mechanistic Studies on Klebsiella pneumoniae 2-Oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline Decarboxylase., French JB, Ealick SE, J Biol Chem. 2010 Nov 12;285(46):35446-54. Epub 2010 Sep 8. PMID: 20826786

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