1HDQ:
reference: Insight into the stereochemistry in the inhibition of carboxypeptidase A with N-(hydroxyaminocarbonyl)phenylalanine: binding modes of an enantiomeric pair of the inhibitor to carboxypeptidase A., Cho JH, Kim DH, Chung SJ, Ha NC, Oh BH, Yong Choi K, Bioorg Med Chem. 2002 Jun;10(6):2015-22. PMID: 11937361

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