STRUTCTURE OF SWERTIAMACROSIDE FROM SWERTIA MACROSPERMA C. B. CLARK

From the air-dried whole plant of SwerBia macrosperma C. B.Clark four compounds Ⅰ～Ⅳ were isolated. One of them is a new caffeic acid disaccharide ester. Its structure was elucidated as 1-O-trans-caffeoyl6-O-α-L-rhamnopyranosyl-β-D-glucopyranoside, i. e. trans caffeic acid-1-O-rutinose ester on the basis of chemical and spectroscopic analysis, and named swertiamacroside (Ⅰ). The other three known compounds were identified as mangiferin (Ⅱ), bellidifodin (Ⅲ) and bellidifodin-8-O-β-D-glucopyranoside (Ⅳ).