2YOX:
reference: The copper active site of CBM33 polysaccharide oxygenases., Hemsworth GR, Taylor E, Kim RQ, Gregory RC, Lewis SJ, Turkenburg JP, Parkin A, Davies GJ, Walton PH, J Am Chem Soc. 2013 Mar 29. PMID: 23540833

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