5MZW:
reference: AibA/AibB Induces an Intramolecular Decarboxylation in Isovalerate Biosynthesis by Myxococcus xanthus., Bock T, Luxenburger E, Hoffmann J, Schutza V, Feiler C, Muller R, Blankenfeldt W, Angew Chem Int Ed Engl. 2017 Aug 7;56(33):9986-9989. doi: 10.1002/anie.201701992., Epub 2017 May 16. PMID: 28508504

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