3QP9:
reference: Structural and functional analysis of c2-type ketoreductases from modular polyketide synthases., Zheng J, Keatinge-Clay AT, J Mol Biol. 2011 Jul 1;410(1):105-17. Epub 2011 May 5. PMID: 21570406

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