Vibralactone: A Lipase Inhibitor with an Unusual Fused β-Lactone Produced by Cultures of the Basidiomycete Boreostereum vibrans

Abstract
The structure and absolute configuration of vibralactone (1) from the cultures of the Basidiomycete Boreostereum vibrans were established by spectroscopic methods and computational methods. Vibralactone, an unusual fused β-lactone-type metabolite, was found to inhibit pancreatic lipase with an IC50 of 0.4 μg/mL.