1UW8:
reference: A closed conformation of Bacillus subtilis oxalate decarboxylase OxdC provides evidence for the true identity of the active site., Just VJ, Stevenson CE, Bowater L, Tanner A, Lawson DM, Bornemann S, J Biol Chem 2004 May 7;279(19):19867-74. Epub 2004 Feb 10. PMID: 14871895

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