Structure elucidation and NMR assignment of two new eudesmane derivatives from Merremia yunnanensis

Two new eudesmane derivatives, 1α,6β,9β‐trihydroxy‐eudesm‐3‐ene‐1‐O‐β‐d‐glucopyranoside (1) and 1α,6β,9β‐trihydroxy‐eudesm‐3‐ene‐1‐(6‐cinnamoyl)‐O‐β‐d‐glucopyranoside (2) were discovered from Merremia yunnanensis. The structures were elucidated by analysis of their spectroscopic data including HR‐ESI‐MS, 1D, and 2D NMR. It should be noted that this is the first report about structure elucidation and NMR assignment of compounds from M. yunnanensis. Two new eudesmane derivatives, 1α,6β,9β‐trihydroxy‐eudesm‐3‐ene‐1‐O‐β‐d‐glucopyranoside (1) and 1α,6β,9β‐trihydroxy‐eudesm‐3‐ene‐1‐(6‐cinnamoyl)‐O‐β‐d‐glucopyranoside (2) were discovered from Merremia yunnanensis. The structure was elucidated by analysis of its spectroscopic data including HR‐EI‐MS, 1D, and 2D NMR.