Two new antioxidant bergenin derivatives from the stem of Rivea hypocrateriformis

Two new bergenin derivatives, named rivebergenin A and B (1, and 2), together with two known compounds, bergenin (3) and norbergenin (4) were isolated from the stem of Rivea hypocrateriformis (Desr.) Choisy. The structures of the new compound have been assigned from 1H and 13C NMR spectra, DEPT, and by 2D COSY, HMQC, and HMBC experiments. Compounds 1–4 showed the strong antioxidant activity.

Two new bergenin derivatives, named rivebergenin A and B (1, and 2), were isolated from the stem of Rivea hypocrateriformis (Desr.) Choisy. Rivebergenin A (1) and B (2), showed the strong antioxidant activity.Figure optionsDownload as PowerPoint slide