Eudesmane Derivatives fromFlourensia thurifera: Structure and Biological Activity

Abstract 3β-hydroxycostic acid and a mixture of two acyl (angelate and 3-methylbutyrate) derivatives were isolated from the aerial part of Flourensia thurifera. The structures were assigned on the basis of NMR spectra and hydrolysis. The toxicity towards Artemia salina and feeding deterrency against Spodoptera littoralis of some derivatives are also briefly discussed.