(R,R)-Hymeglusin is a specific and irreversible inhibitor of 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) synthase in vitro and in vivo by covalently modifying the active Cys129 residue of the enzyme. It is a fungal beta-lactone that inhibits mevalonate biosynthesis and is a good target for statins. It displays antimicrobial and anti-fungal activity. MW: 324.41. Purity ≥95% by HPLC