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.
B. S. Joshi, V. N. Kamat, T. R. Govindachari, B. R. Pai, G. Kartha and K. T. Go, J. Chem. Soc., Perkin Trans. 1, 1974, 2517 DOI: 10.1039/P19740002517
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