Lignans from Daphne feddei Levl. var and their cytotoxicity.

A new neolignan, daphnelignan C (1), together with four known one, were isolated from the leaves of Daphne feddei levl. var. The structures of daphnelignan C (1) were elucidated by spectroscopic methods, including extensive 1-D and 2-D NMR techniques. All the five compounds were tested for their cytotoxicity. Compound daphnelignan C (1) showed significant potential cytotoxic ability and weak anti HIV-1 activities.