4BVT:
reference: Cyanuric acid hydrolase: evolutionary innovation by structural concatenation., Peat TS, Balotra S, Wilding M, French NG, Briggs LJ, Panjikar S, Cowieson N, Newman J, Scott C, Mol Microbiol. 2013 Jun;88(6):1149-63. doi: 10.1111/mmi.12249. Epub 2013 May 20. PMID: 23651355

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