Chemical and chemotaxonomical studies of ferns. XXXIX. Chemical studies on the constituents of Pteris bella Tagawa and Pteridium aquilinum subsp. wightianum (Wall) Shich.

From the fronds of Pteris bella, three new pterosin-type compounds, I, III and XI, were isolated along with pterosins B (VI), C (II), Q (VII) and T (IV), setulosopterosin (X), pterosin C 3-O-β-D-glucoside (IX) and pterosin Q 3-O-β-D-glucoside (VIII). From the fronds of Pteridium aquilinum subsp. wightianum, two new pterosin-type compounds, XVI and XVII, were isolated along with pterosins C (II), D (XVIII), F (XXII), H (XX), I (XXI) and Z (XIX) and astragalin (XXIII). The structures of the new compounds were determined on the basis of chemical and spectral data.