Crystal Structure of the Native Sesquiterpene Lactone Arctolide

Abstract

X-Ray structure analysis of the native sesquiterpenic arctolide (I) was performed. The results gave evidence that the relative configuration of the hydroxy group at C(3) in the initially suggested arctolide formula (II) has to be corrected to β. Related to this modification, formulas of some other native lactones and derivatives which had been corelated with arctolide before were also corrected.