Crude Drugs from Aquatic Plants. II. On the Constituents of the Rhizome of Alisma orientale JUZEP. Originating from Japan, Taiwan, and China. Absolute Stereostructures of 11-Deoxyalisols B and B 23-Acetate.

Abstract

Two new protostane-type triterpenes named 11-deoxyalisols B and B 23-acetate were isolated from the fresh rhizome of Alisma orientale JUZEP. originating from Japan, Taiwan, and China, together with known triterpenes and sesquiterpenes. The absolute stereostructures of 11-deoxyalisols B and B 23-acetate have been determined on the basis of chemical and physicochemical evidence. Sesquiterpene compositions in fresh rhizomes of Alisma orientale of the three different origins were examined and it was found that Japanese rhizome contained germacrene D as a major constituent, while fresh rhizomes from plants of Taiwanese and Chinese origin contained germacrene C and small amounts of alismol and alismoxide.