5XFV:
reference: Crystal structures of FMN-bound and FMN-free forms of dihydroorotate dehydrogenase from Trypanosoma brucei., Kubota T, Tani O, Yamaguchi T, Namatame I, Sakashita H, Furukawa K, Yamasaki K, FEBS Open Bio. 2018 Mar 6;8(4):680-691. doi: 10.1002/2211-5463.12403. eCollection, 2018 Apr. PMID: 29632820

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