1EP2:
reference: Structure of dihydroorotate dehydrogenase B: electron transfer between two flavin groups bridged by an iron-sulphur cluster., Rowland P, Norager S, Jensen KF, Larsen S, Structure Fold Des 2000 Dec 15;8(12):1227-38. PMID: 11188687

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