4DPY:
reference: Structural Basis for Nucleotide Binding and Reaction Catalysis in Mevalonate Diphosphate Decarboxylase., Barta ML, McWhorter WJ, Miziorko HM, Geisbrecht BV, Biochemistry. 2012 Jul 6. PMID: 22734632

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