Structure of wightionolide: chemical and X-ray analysis
Abstract
Wightionolide isolated from the leaves of Andrographis wightiana Arn. ex Nees is shown to be 17,19,20-trihydroxy-5β,8αH,9βH,10α-labd-13-en-16,15-olactone (XII). The molecular structure of the dibromo-triacetate (V) of wightionolide has been determined by X-ray diffraction studies.