1BUC:
reference: Three-dimensional structure of butyryl-CoA dehydrogenase from Megasphaera elsdenii., Djordjevic S, Pace CP, Stankovich MT, Kim JJ, Biochemistry 1995 Feb 21;34(7):2163-71. PMID: 7857927

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