3GMZ:
reference: Binding of alpha,alpha-Disubstituted Amino Acids to Arginase Suggests New Avenues for Inhibitor Design., Ilies M, Di Costanzo L, Dowling DP, Thorn KJ, Christianson DW, J Med Chem. 2011 Jul 18. PMID: 21728378

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