6EN5:
reference: The Design and Development of a Potent and Selective Novel Diprolyl Derivative that Binds to the N-domain of Angiotensin-I Converting Enzyme., Fienberg S, Cozier GE, Acharya KR, Chibale K, Sturrock ED, J Med Chem. 2017 Dec 5. doi: 10.1021/acs.jmedchem.7b01478. PMID: 29206036

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