Saponins of red ginseng.

From Red Ginseng, all of the known saponins of White Ginseng were isolated in yields similar to those obtained from White Ginseng. Two additional minor saponins, notoginsenoside-R1 (19) (the saponin of roots of Panax notoginseng) and quinquenoside-R1 (20) (the saponin of roots of P. quinquefolium), were also isolated and identified. Besides these known saponins, two new minor saponins named ginsenosides-Rs1 (17) and -Rs2 (18) were also isolated. Compounds 17 and 18 were established to be monoacetates at the 6-hydroxyl group of the terminal glucosyl moiety of the sophorosyl unit of ginsenosides-Rb2 (5) and-Rc (7), respectively.