2XUA:
reference: A Product Analog Bound Form of 3-Oxoadipate-enol-Lactonase (PcaD) Reveals a Multifunctional Role for the Divergent Cap Domain., Bains J, Kaufman L, Farnell B, Boulanger MJ, J Mol Biol. 2011 Jan 13. PMID: 21237173

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