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Two new antioxidant bergenin derivatives from the stem of Rivea hypocrateriformis
Zamarrud1, Iftikhar Ali, Hidayat Hussain
1Department of Botany, University of Karachi, Karachi-75270, Pakistan.
Fitoterapia
|March 17, 2011
Abstract:
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 (1)H and (13)C NMR spectra, DEPT, and by 2D COSY, HMQC, and HMBC experiments. Compounds 1-4 showed the strong antioxidant activity.
