| Abstract
| - A novel flavonol glycoside, 7-O-methylmearnsitrin (7,4‘-O-dimethylmyricetin 3-O-α-l-rhamnopyranoside), and myricetrin, kaempferol 3-O-α-l-rhamnopyranoside, europetin 3-O-α-l-rhamnoside, and 7-O-methyl quercetin 3-O-α-l-rhamnopyranoside were isolated from the leaves of Sageretia theezans,and their chemical structures were identified by spectroscopic analyses including two-dimensionalNMR (HSQC, HMBC). Whereas myricetrin, europetin 3-O-α-l-rhamnoside, and 7-O-methylquercetin3-O-α-l-rhamnopyranoside showed stronger activities than ascorbic acid and α-tocopherol, 7-O-methylmearnsitrin showed very weak antioxidant activities by ESR and LDL oxidation inhibition tests. Keywords: Flavonol glycosides; 7-O-methylmearnsitrin; Sageretia theezans; ESR; LDL oxidation
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