4PXC:
reference: Structural Insights into the Substrate Specificity of (S)-Ureidoglycolate Amidohydrolase and Its Comparison with Allantoate Amidohydrolase., Shin I, Han K, Rhee S, J Mol Biol. 2014 Jul 11. pii: S0022-2836(14)00333-7. doi:, 10.1016/j.jmb.2014.06.017. PMID: 25020232

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