Sesqui- and diterpenoids from the Japanese liverwort Jungermannia infusca

Seven new cuparane-type (1-7), one new acorane-type (8), one new monocyclic-type (9), and one new prelacinane-type (10) sesquiterpenoid as well as two new clerodane-type (11, 12) and one new halimane-type (13) diterpenoid were isolated from the Japanese liverwort Jungermannia infusca, together with 12 known cuparane- (14-21) and aromadendrane-type (22) sesquiterpenoids and labdane- (23) and ent-kaurane-type (24) diterpenoids. The structures for 1-13 were determined using extensive NMR techniques and by chemical degradation and X-ray crystallographic analysis.