6V59:
reference: A Stable Ferryl Porphyrin at the Active Site of Y463M BthA., Rizzolo K, Weitz AC, Cohen SE, Drennan CL, Hendrich MP, Elliott SJ, J Am Chem Soc. 2020 Jul 1. doi: 10.1021/jacs.0c04023. PMID: 32564595

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