Four new malonylated dammarane-type triterpene oligoglycosides, named malonyl-ginsenosides Rb1 (1), Rb2 (2), Rc (3), and Rd (4), were isolated from Ginseng Radix, the root of Panax ginseng, and their structures were elucidated on the basis of chemical and physicochemical evidence.
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Kitagawa et al. (1983) studied this question.