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Abstract
Two new fluorenones have been isolated from the orchid Dendrobium chrysotoxum Lindl. and their structures established as 2,4,7-trihydroxy-5-methoxy-9-fluorenone and 2,4,7-trihydroxy-1,5-dimethoxy-9-fluorenone.
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Acknowledgements
This research was financially supported by the National Science Foundation of China for Professor L.S. Xu (No 30171144) and the Science and Technology Development Fund of Shanghai for Professor Z.T. Wang (00XD14022). We also thank Drs Xu Hong and Ding Xiaoyu, Department of Pharmacognosy, China Pharmaceutical University for providing plant material.