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Emodin (6-methyl-1,3,8-trihydroxyanthraquinone) is a chemical compound that can be isolated from rhubarb, buckthorn, and Japanese knotweed (Reynoutria japonica syn. Polygonum cuspidatum).
E 1232 (OTTO) Emodin, ≥90% Cas 518-82-1 - used as a reference standard for the development and validation of high performance liquid chromatography (HPLC)-photodiode array (PDA) assay method.