3QIT:
reference: Terminal alkene formation by the thioesterase of curacin a biosynthesis: Structure of a decarboxylating thioesterase., Gehret JJ, Gu L, Gerwick WH, Wipf P, Sherman DH, Smith JL, J Biol Chem. 2011 Feb 27. PMID: 21357626

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