A new triterpenoidal saponin, echinocystic acid 3-O-beta -D-glucopyranosyl-
(1 --> 3)-alpha -L-arabinopyranoside (1), was isolated from Ixeris sonchifo
lia. Its structure was elucidated on the basis of full spectral data analys
is and chemical methods. The cytotoxic activity of compound I was evaluated
using the tumor cell lines of A375, Hela, and L929 in vitro.