6MBG:
reference: Molecular Basis for Olefin Rearrangement in the Gephyronic Acid Polyketide Synthase., Dodge GJ, Ronnow D, Taylor RE, Smith JL, ACS Chem Biol. 2018 Sep 12. doi: 10.1021/acschembio.8b00645. PMID: 30179448

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