Two New Sesquiterpene Glucosides from Gymnaster koraiensis

Abstract

Two new sesquiterpene glucosides, 1(R),4β-dihydroxy-trans-eudesm-6-ene-1-O-β-D-glucopyranoside (1) and 1(R),4β-dihydroxy-trans-eudesm-7-ene-1-O-β-D-glucopyranoside (2), together with six other known compounds, were isolated from the flowers of Gymnaster koraiensis (Nakai) Kitamura (Compositae).The identification and structural elucidation of these compounds were based on 1D-and 2D-NMR spectral data analysis.The absolute configurations of 1 and 2 were determined by a convenient Mosher ester procedure carried out in NMR tube.