Six new lignans from Heterosmilax yunnanensis and their hepatoprotective activity evaluation.
From the roots of Heterosmilax yunnanensis Gagnep., ten lignans were isolated, including six previously undescribed compounds (1-6) and four known compounds (7-10). Structurally, compounds 1 and 3 are novel examples of lignan-amino acid adducts in nature. The other compounds are all lignan glucosides. Their planar stru...