| US 7,514,412 B2 | ||
| Anticancer biangeloyl saponins | ||
| Pui-Kwong Chan, Sugarland, Tex. (US); May Sung Mak, Kowloon (Hong Kong Special Administrative Region of the People's Republic of China, The); and Yun Wang, Dunedin (New Zealand) | ||
| Assigned to Pacific Arrow Limited, North Point, Hong Kong (China) | ||
| Filed on Apr. 27, 2005, as Appl. No. 11/117,745. | ||
| Prior Publication US 2005/0245470 A1, Nov. 03, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A61K 31/704 (2006.01); C07H 15/256 (2006.01) | ||
| U.S. Cl. 514—33 [536/18.1; 536/18.2] | 23 Claims |
1. An isolated compound of formula (1):
 R1, R2 represents angeloyl group or sugar moiety with diangeloyl groups;
R3 represents OH or H;
R4 represents CH3 or CH2OH; and
R5 represents D-glucose or D-Galactose
R6 represents H or Ac.
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