3KRZ:
reference: Biocatalysis with thermostable enzymes: structure and properties of a thermophilic 'ene'-reductase related to old yellow enzyme., Adalbjornsson BV, Toogood HS, Fryszkowska A, Pudney CR, Jowitt TA, Leys D, Scrutton NS, Chembiochem. 2010 Jan 25;11(2):197-207. PMID: 19943268

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