作者:Ting Wu、Qing-Wen Zhang、Xiao-Qi Zhang、Ge Liu、Lei Wang、Miao-Miao Jiang、Yi-Fan Feng、Wen-Cai Ye
DOI:10.1080/14786419.2011.598155
日期:2012.8.1
A new triterpenoid glycoside, heterobetulinic acid 3-O-beta-D-glucopyranosyl (1 -> 2)-beta-D-xylopyranoside (1), together with a new phenylacrylic acid derivative, 3'S,4'-dihydroxyl-2'-methylene-but-1'-enyl caffeate (2), were isolated from the roots of Ilex pubescens. Their structures were elucidated by HR-ESI-MS, 1-D and 2-D NMR analyses and chemical methods. In addition, the absolute configuration of 2 was established by the application of a modified Mosher's method.