2CIX:
reference: Crystal structures of chloroperoxidase with its bound substrates and complexed with formate, acetate, and nitrate., Kuhnel K, Blankenfeldt W, Terner J, Schlichting I, J Biol Chem. 2006 Aug 18;281(33):23990-8. Epub 2006 Jun 20. PMID: 16790441

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