Cytotoxic Phenolic Constituents from the Root ofActinidia chinensis

Twelve phenolic compounds, including four novel skeleton phenolic compounds, planchols A-D (1-4), together with four pairs of isomeric flavanoids (5-12) were isolated from the root of Actinidia chinensis Planch (Actinidiaceae). Their structures were elucidated by spectroscopic analysis and chemical evidence. The structure of 1 was further confirmed by a single-crystal X-ray diffraction determination. Moreover, it was found that 1 and 2 showed remarkable cytotoxic activity against P-388 and A-549 cell lines.