5CX1:
reference: Evidence for Functionally Relevant Encounter Complexes in Nitrogenase Catalysis., Owens CP, Katz FE, Carter CH, Luca MA, Tezcan FA, J Am Chem Soc. 2015 Oct 7;137(39):12704-12. doi: 10.1021/jacs.5b08310. Epub 2015 , Sep 24. PMID: 26360912

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