The isolation and structural elucidation of a new iridoid glycoside from Cymbaria dahurica L.

A new iridoid glycoside, namely, cymdahoside A ( 1 ), together with two known ones, 2 and 3 , were isolated from the EtOAc extract of Cymbaria dahurica . The structure elucidation of 1 was carried out by one-dimensional (1D) NMR ( 1 H and 13 C NMR) and 2D NMR (correlation spectroscopy, heteronuclear single-quantum coherence, heteronuclear multiple-bond correlation and nuclear Overhauser effect spectroscopy) spectral...