3HF5:
reference: Crystal structure and catalytic mechanism of 4-methylmuconolactone methylisomerase., Marin M, Heinz DW, Pieper DH, Klink BU, J Biol Chem. 2009 Nov 20;284(47):32709-16. Epub 2009 Sep 29. PMID: 19801657

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