由公式C<sub>n</sub><sup>k</sup>+C<sub>n</sub><sup>k+1</sup>=C<sub>n+1</sub><sup>k+1</sup>,可得:C<sub>2</sub><sup>2</sup>+...由公式C<sub>n</sub><sup>k</sup>+C<sub>n</sub><sup>k+1</sup>=C<sub>n+1</sub><sup>k+1</sup>,可得:C<sub>2</sub><sup>2</sup>+C<sub>3</sub><sup>2</sup>+…+C<sub>n</sub><sup>2</sup>=C<sub>n+1</sub><sup>3</sup>,sum from k=2 to nC<sub>k</sub><sup>2</sup>=C<sub>n+1</sub><sup>3</sup>,展开更多
One new Iriterpene saponin was isolated from Panaxjaponicus C. A. Meyer var major （Burk.） C. Y. Wu et K. M. Feng, and established as oleanolic acid 3-O-[β-D-glucopyranosyl-（1 →2）-β-D-glucuronopyranosyl-6＇-O-n-...One new Iriterpene saponin was isolated from Panaxjaponicus C. A. Meyer var major （Burk.） C. Y. Wu et K. M. Feng, and established as oleanolic acid 3-O-[β-D-glucopyranosyl-（1 →2）-β-D-glucuronopyranosyl-6＇-O-n-butyl ester] which showed mod- erate antitumor activities against the A2780 cells and OVCAR-3 cells. Its structure was established by means of spectral data, particularly NMR, including HSQC and HMBC techniques.展开更多
文摘由公式C<sub>n</sub><sup>k</sup>+C<sub>n</sub><sup>k+1</sup>=C<sub>n+1</sub><sup>k+1</sup>,可得:C<sub>2</sub><sup>2</sup>+C<sub>3</sub><sup>2</sup>+…+C<sub>n</sub><sup>2</sup>=C<sub>n+1</sub><sup>3</sup>,sum from k=2 to nC<sub>k</sub><sup>2</sup>=C<sub>n+1</sub><sup>3</sup>,
基金financially supported by Chinese Academy of Nutritional Sciences,Shanghai Institutes for Biological Sciences
文摘One new Iriterpene saponin was isolated from Panaxjaponicus C. A. Meyer var major （Burk.） C. Y. Wu et K. M. Feng, and established as oleanolic acid 3-O-[β-D-glucopyranosyl-（1 →2）-β-D-glucuronopyranosyl-6＇-O-n-butyl ester] which showed mod- erate antitumor activities against the A2780 cells and OVCAR-3 cells. Its structure was established by means of spectral data, particularly NMR, including HSQC and HMBC techniques.
