3JUN:
reference: The active site of an enzyme can host both enantiomers of a racemic ligand simultaneously., Mentel M, Blankenfeldt W, Breinbauer R, Angew Chem Int Ed Engl. 2009;48(48):9084-7. PMID: 19876985

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