A new ecdysterone fromRhaponticum uniflorum Chemical constituents of Rhaponticum uniflorum Chemical constituents from flowers of Rhaponticum uniflorum Composition of Essential Oil from Inflorescences of Rhaponticum uniflorum (L.) DC Herbalogic Study of Chinese Drug Loulu A New Triterpenoid Saponin from Rhaponticum uniflorum (Compositae) Triterpenes from root of Rhaponticum uniflorum