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Three new compounds (6 S ,9 S )-6′-galloyl-roseoside ( 1 ), purpurogallin ethyl carboxylate ( 2 ), and tibetana A ( 3 ) were isolated from 80% methanol extract of the leaves of  Castanopsis tibetana  Hance. Their structures were elucidated based on comprehensive spectroscopic methods and chemical data, including optical rotation, UV, MS, 1 D and 2 D NMR spectra. Compounds  1  and  3  were evaluated for their  α -glucosidase inhibitory activity, pancreatic lipase inhibitory activity, and tyrosinase inhibitory activity.

Three new compounds from the leaves of Castanopsis tibetana Hance