1Z2L:
reference: Structural analysis of a ternary complex of allantoate amidohydrolase from Escherichia coli reveals its mechanics., Agarwal R, Burley SK, Swaminathan S, J Mol Biol. 2007 Apr 27;368(2):450-63. Epub 2007 Feb 20. PMID: 17362992

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