2FR1:
reference: The Structure of a Ketoreductase Determines the Organization of the beta-Carbon Processing Enzymes of Modular Polyketide Synthases., Keatinge-Clay AT, Stroud RM, Structure. 2006 Apr;14(4):737-48. Epub 2006 Mar 23. PMID: 16564177

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