Abstract
Three new flavonoid glycosides, named 7,8,4′-trihydroxy-3,5-dimethoxy-6-methylflavonol-8-O-β-D-glucopyranoside (1), 5,7,4′-trihydroxy-3-methoxy-6-methylflavonol-7-O-β-D-glucopyranoside (2), 3,5,7,4′-tetrahydroxy-6-methylflavonol-7-O-β-D-glucopyranoside (3), together with two known flavonoid glycosides were isolated from the needles of Pinus tabulaeformis Carr. Their structures were established on the basis of various spectroscopic analyses.
Acknowledgements
The authors are grateful to Prof. Cheng-Ming Dong (Henan University of Traditional Chinese Medicine, China) for collecting and identifying the plant material, and they thank Prof. Jian-Xun Kang and Prof. Wei-Guo Zhu (Zhengzhou University, China) for recording the NMR spectra.