3HF3:
reference: Crystal structure of a thermostable Old Yellow Enzyme from Thermus scotoductus SA-01., Opperman DJ, Sewell BT, Litthauer D, Isupov MN, Littlechild JA, van Heerden E, Biochem Biophys Res Commun. 2010 Feb 6. PMID: 20138824

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