Vibralactones U–W, three vibralactone derivatives from cultures of the basidiomycete Boreostereum vibrans.

Three new vibralactone derivatives, namely vibralactones U–W (1–3), together with vibralactone (4), have been isolated from cultures of the basidiomycete Boreostereum vibrans. Their structures were determined on the basis of spectroscopic methods and literature data. All compounds showed no activities to five human cancer cell lines. [ABSTRACT FROM AUTHOR]