3WC6:
reference: Structural Basis for Inhibition of Carboxypeptidase B by Selenium-Containing Inhibitor: Selenium Coordinates to Zinc in Enzyme., Yoshimoto N, Itoh T, Inaba Y, Ishii H, Yamamoto K, J Med Chem. 2013 Sep 24. PMID: 24010887

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