1YPG:
reference: A Simple Protocol To Estimate Differences in Protein Binding Affinity for Enantiomers without Prior Resolution of Racemates., Fokkens J, Klebe G, Angew Chem Int Ed Engl. 2005 Dec 22;. PMID: 16374786

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