6FUU:
reference: An Artificial Heme Enzyme for Cyclopropanation Reactions., Villarino L, Splan K, Reddem E, Gutierrez de Souza C, Alonso-Cotchico L, Lledos A, Marechal JD, Thunnissen AM, Roelfes G, Angew Chem Int Ed Engl. 2018 May 2. doi: 10.1002/anie.201802946. PMID: 29719099

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