2OLR:
reference: How does an enzyme recognize CO(2)?, Cotelesage JJ, Puttick J, Goldie H, Rajabi B, Novakovski B, Delbaere LT, Int J Biochem Cell Biol. 2007;39(6):1204-10. Epub 2007 Mar 30. PMID: 17475535

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