6GMI:
reference: Genetic Engineering of an Artificial Metalloenzyme for Transfer Hydrogenation of a Self-Immolative Substrate in Escherichia coli's Periplasm., Zhao J, Rebelein JG, Mallin H, Trindler C, Pellizzoni MM, Ward TR, J Am Chem Soc. 2018 Oct 3. doi: 10.1021/jacs.8b07189. PMID: 30272972

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