6JX2:
reference: Crystal Structure and Biochemical Characterization of Ketol-Acid Reductoisomerase from Corynebacterium glutamicum., Lee D, Hong J, Kim KJ, J Agric Food Chem. 2019 Jul 25. doi: 10.1021/acs.jafc.9b03262. PMID: 31298526

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