2FHK:
reference: The Structure of Formylmethanofuran: Tetrahydromethanopterin Formyltransferase in Complex with its Coenzymes., Acharya P, Warkentin E, Ermler U, Thauer RK, Shima S, J Mol Biol. 2006 Jan 23;. PMID: 16466742

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