Extraction of the aerial parts of Ophiorrhiza major Ridl. has yielded a new C19 pentacyclic quaternary indole alkaloid, ophiorrhizine. The structure was established as 1 on the grounds of its spectral properties (optical rotation) and its X-ray molecular structure. Its biosynthetic relationship to the Cinchona alkaloids is discussed.
D. Arbain, L. T. Byrne, D. P. Putra, M. V. Sargent, B. W. Skelton and A. H. White, J. Chem. Soc., Perkin Trans. 1, 1992, 663 DOI: 10.1039/P19920000663
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