3C7I:
reference: Ligand preorganization may be accompanied by entropic penalties in protein-ligand interactions., Benfield AP, Teresk MG, Plake HR, DeLorbe JE, Millspaugh LE, Martin SF, Angew Chem Int Ed Engl. 2006 Oct 20;45(41):6830-5. PMID: 17001728

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