Triterpenoid saponins and monoterpenoid glycosides from Incarvillea delavayi

Two new triterpenoid saponins, incarvillosides A (1) and B (2), and two new monoterpenoid glycosides, incarvillosides C (3) and D (4), were isolated from the high-polarity fraction of the whole plant of Incarvillea delavayi. By means of spectroscopic data and chemical degradation, the structures were established as (3 beta, 21 beta)-3,19,21,23-tetrahydroxyurs-12-en-28-oic acid 28-O-beta-D-glucopyranoside (1), (2 beta, 3 beta, 19 alpha)-2,3,19,23-tetrahydroxyolean-12-en-28-oic acid 28-O-beta-D-glucopyranoside (2), (2S, 6R)-2,6-dimethyl-1,8-octanediol 1-O-beta-D-glucopyranoside (3), and (2S, 6R)-2,6-dimethyl-1,8-octanediol 8-O-beta-D-glucopyranoside (4).