4HHR:
reference: The Crystal Structure of alpha-Dioxygenase Provides Insight into Diversity in the Cyclooxygenase-Peroxidase Superfamily., Goulah CC, Zhu G, Koszelak-Rosenblum M, Malkowski MG, Biochemistry. 2013 Feb 14. PMID: 23373518

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