6E2S:
reference: Visualizing the enzyme mechanism of mevalonate diphosphate decarboxylase., Chen CL, Paul LN, Mermoud JC, Steussy CN, Stauffacher CV, Nat Commun. 2020 Aug 7;11(1):3969. doi: 10.1038/s41467-020-17733-0. PMID: 32769976

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