4U3V:
reference: A Double-Hotdog with a New Trick: Structure and Mechanism of the trans-Acyltransferase Polyketide Synthase Enoyl-isomerase., Gay DC, Spear PJ, Keatinge-Clay AT, ACS Chem Biol. 2014 Aug 14. PMID: 25089587

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