A new flavonoid, 5,7-dihydroxy-2-(1-hydroxy-2,6-dimethoxy-4-oxo-cyclohex)-chromen-4-one (1), was isolated from the roots of Macrothelypteris torresiana (Gaud.) Ching. (Thelypteridaceae). The structure of the product was identified on the basis of detailed spectral analysis, including X-ray structure analysis.
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The author is grateful to the Analytical and Testing Center of Huazhong University of Science and Technology for measuring the NMR spectrum, and to the Department of Chemistry, Central China Normal University for X-ray structure analysis.
The Institute of Botany, Chinese Academy of Sciences, Chinese Flora, Chapter 1, Vol. 4, Science Publisher, Beijing, 1999, pp. 79–80.Google Scholar