Dibenzocyclooctadiene lignans from Schisandra lancifolia and their anti-human immunodeficiency virus-1 activities

Three new dibenzocyclooctadiene Lignans, schilancifolignans A-C (1-3), together with thirteen known ones, were isolated from the leaves and stems of Schisandra lancifolia. The structures of 1-3 were elucidated by spectroscopic methods, including extensive 1D- and 2D-NMR techniques. Compounds 1-3 were tested for their anti-human immunodeficiency virus-1 activities and showed weak bioactivities.