5YL3:
reference: Manganese(V) Porphycene Complex Responsible for Inert C-H Bond Hydroxylation in a Myoglobin Matrix., Oohora K, Meichin H, Kihira Y, Sugimoto H, Shiro Y, Hayashi T, J Am Chem Soc. 2017 Dec 14. doi: 10.1021/jacs.7b11288. PMID: 29237270

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