Schisanwilsonins A–G and related anti-HBV lignans from the fruits of Schisandra wilsoniana

Seven new dibenzocyclooctane lignans, schisanwilsonins A–G (1–7), were isolated from the fruits of Schisandra wilsoniana, together with five known lignans (8–12). The structures of these new compounds were elucidated by spectroscopic methods including 2D-NMR techniques. The 12 lignans were tested for anti-hepatitis B virus (HBV) activity in vitro. Schisanwilsonin D (4), schisantherin C (9), deoxyschizandrin (10) and (+)-gomisin K3 (11) showed anti-HBV activity. 9 exhibited the most potent anti-HBV activity with potency against HBsAg and HBeAg secretion by 59.7% and 34.7%, respectively, at 50 μg/mL.