1IWH:
reference: Crystal structure of horse carbonmonoxyhemoglobin-bezafibrate complex at 1.55-A resolution. A novel allosteric binding site in R-state hemoglobin., Shibayama N, Miura S, Tame JR, Yonetani T, Park SY, J Biol Chem 2002 Oct 11;277(41):38791-6. Epub 2002 Jul 16. PMID: 12122004

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