Ten coumarins were isolated from the root of Angelica dahurica by repeated silica gel column
chromatography. Their chemical structures were elucidated on the basic of physicochemical
and spectroscopic data. Among them, oxypeucedanin hydrate acetonide (7) was isolated for
the first time from this plant. Cytotoxicity of coumarins isolated were determined in vitro against
L1210, HL-60, K562, and B16F10 tumor cell lines by MTT method. Pangelin (5) and oxypeucedanin
hydrate acetonide (7) showed a potent cytotoxic activity with the ICso values of 8.6 to
14.6 pg/mL against four kinds of tumor cell lines. Other compounds showed the moderate
cytotoxic activity or no activity against the tumor cell lines.