5V6U:
reference: Allosteric Tuning of Caspase-7: A Fragment-Based Drug Discovery Approach., Vance NR, Gakhar L, Spies MA, Angew Chem Int Ed Engl. 2017 Sep 22. doi: 10.1002/anie.201706959. PMID: 28940929

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