A new indole alkaloidal glucoside together with three known compounds aurantiamide acetate (2), eleutheroside E (3) and 1-O-caffeoyl--d-glucopyranoside (4) has been isolated from ethanol extract of the aerial parts of Clematis terniflora DC. On the basis of their spectroscopic and chemical evidence, the new compound was elucidated as (6-O--d-glucopyranosyl-1H-indol-3-yl) carboxylic acid methyl ester (1). Compounds 1 and 3 showed significant cytotoxicity against human ECA-109.