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Abstract
Five new compounds, dencryol A (1), dencryol B (2), crystalltone (3), crystallinin (4), and 3-hydroxy-2-methoxy-5,6-dimethylbenzoic acid (5), together with six known compounds, dendronobilin B (6), syringic acid (7), apigenin (8), isoviolanthin (9), 6‴-glucosyl-vitexin (10), and palmarumycin JC2 (11), have been isolated from the stems of Dendrobium crystallinum, of which compounds 9–11 were isolated from the genus Dendrobium for the first time, and all the other compounds were first obtained from this plant. Their structures were established on the basis of spectroscopic analysis and literature data.
Acknowledgements
We are grateful to Dr Dong-Jun Chen and Associate Professor De-Ran Xu of China Pharmaceutical University for NMR and ESI-MS spectra. This work was supported by the Natural Science Foundation of China (NSFC) for Luo-Shan Xu (No. 3017114), the 211 program for Chao-Feng Zhang (No. 2004), and the Foundation of Young Teachers of China Pharmaceutical University (No. B0606).