6WE6:
reference: The Proton Relay Network in the Bacterial P450s: CYP101A1 and CYP101D1., Amaya JA, Batabyal D, Poulos TL, Biochemistry. 2020 Jun 23. doi: 10.1021/acs.biochem.0c00329. PMID: 32574066

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