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Rheum palmatum L. (Chinese rhubarb) is a highly regarded medicinal plant. Its dominant active constituents are anthraquinones including emodin, aloe-emodin, rhein, etc. Rhein naturally occurs in anthraquinone (1, 3, 8-trihydroxy-6-methyl anthraquinone), which is found in R. palmatum L. and related plants such as rhubarb. It has good antitumor, anti-inflammatory, anticancer, antimicrobial and hemostatic...
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