STUDIES ON THE CHEMICAL CONSTITUENTS OF ARCTIUM LAPPA L.
HY Wang and JS Yang (Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing 100050)
Six compounds were isolated from the seeds of Arctium lappa L. One of them is a new lignan named neoarctin B(Ⅵ). The structure has been elucidated on the basis of spectral(UV, IR, ~1H-NMR, ~~(13)C-NMR, DEPT, 2D-NMR and MS) analysis. The other five compounds were identified as daucosterol(Ⅰ) , arctigenin (Ⅱ) , arctiin (Ⅲ), matairesinol (Ⅳ) and lappaol F(Ⅴ).