5JWP:
reference: The facial triad in the alpha-ketoglutarate dependent oxygenase FIH: A role for sterics in linking substrate binding to O2 activation., Hangasky JA, Taabazuing CY, Martin CB, Eron SJ, Knapp MJ, J Inorg Biochem. 2016 Oct 17;166:26-33. doi: 10.1016/j.jinorgbio.2016.10.007. PMID: 27815979

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