Abstract
A new flavonoid was isolated from the whole plant of Spiranthes australis (R. Brown) Lindl (Orchidacea). Its structure was characterized as 3,7-dimethoxy-5-hydroxy-2-{[4-(3-methyl-2-butenyl)oxy]phenyl}-4H-1-benzopyran-4-one on the basis of chemical and spectral evidence including 2D NMR analysis.
Acknowledgements
Thanks are due to Professor Yun Zhen Guo, Department of Chinese Medicine Analysis of Shenyang Pharmaceutical University for the analysis of compound 1 and the identification of the plant. We are also grateful to Wen Li and Yi Sha, Department of Instrumental Analysis of Shenyang Pharmaceutical University for NMR measurements.