2Q0M:
reference: Tricarbonylmanganese(I)-lysozyme complex: a structurally characterized organometallic protein., Razavet M, Artero V, Cavazza C, Oudart Y, Lebrun C, Fontecilla-Camps JC, Fontecave M, Chem Commun (Camb). 2007 Jul 19;(27):2805-7. Epub 2007 Jun 11. PMID: 17609782

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