4N7N:
reference: Capturing the Hemoglobin Allosteric Transition in a Single Crystal Form., Shibayama N, Sugiyama K, Tame JR, Park SY, J Am Chem Soc. 2014 Mar 24. PMID: 24635037

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