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Two major stilbene glucosides (1 and 2) have been newly isolated from Chinese rhubarb (commercial name : Gaoh, second grade), and characterized on the basis of chemical and spectroscopic evidence as piceatannol 4'-O-β-D-glucopyranoside (1) and its 6"-O-gallate (2). In addition, high-preformance liquid chromatographic analysis has led to the characterization of minor components including sennoside, anthraquinones, and other stilvenes.
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Kashiwada et al. (1988) studied this question.
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