Bioactive saponins and glycosides. XI. Structures of new dammarane-type triterpene oligoglycosides, quinquenosides I, II, III, IV, and V, from American ginseng, the roots of Panax quinquefolium L. - Yoshikawa ,M,.; Murakami ,T,.; Yashiro ,K,.; Yamahara ,J,.; Matsuda ,H,.; Saijoh ,R,.; Tanaka ,O.. (Chemical & Pharmaceutical Bulletin, 1998)