5FEM:
reference: Commercial Herbicides Can Trigger the Oxidative Inactivation of Acetohydroxyacid Synthase., Lonhienne T, Nouwens A, Williams CM, Fraser JA, Lee YT, West NP, Guddat LW, Angew Chem Int Ed Engl. 2016 Mar 18;55(13):4247-51. doi: 10.1002/anie.201511985. , Epub 2016 Feb 29. PMID: 26924714

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