Absolute Structures of New Megastigmane Glycosides, Foliasalaciosides E₁, E₂, E₃, F, G, H, and I from the Leaves of Salacia chinensis

Abstract

Following the investigation of foliasalaciosides A₁, A₂, B₁, B₂, C, and D, seven new megastigmane glycosides named foliasalaciosides E₁—I (1—7), together with four known constituents, were isolated from the leaves of Salacia chinensis LINN. collected in Thailand. The absolute stereostructures of the new compounds were characterized on the basis of chemical and physicochemical evidence, including the application of the modified Mosher's method.