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Emodin (6-methyl-1,3,8-trihydroxyanthraquinone) is a chemical compound, of the anthraquinone family, that can be isolated from rhubarb, buckthorn, and Japanese knotweed (Reynoutria japonica syn. Polygonum cuspidatum)Emodin is an active component of several plants used in Traditional Chinese Medicine (TCM) such as Rheum palmatum, Polygonum cuspidatum and Polygonum multiflorum. It has various actions including laxative, antibacterial and antiinflammatory effects, has also been identified as having potential antiviral activity against coronaviruses such as SARS-CoV-2, being one of the major active components of the antiviral TCM formulation Lianhua Qingwen