* Synonyms: Anthraquinone, 1, 3, 8-trihydroxy-6-methyl- (8CI); 1, 3, 8-Trihydroxy-6-methyl-9, 10-anthraquinone; 1, 3, 8-Trihydroxy-6-methylanthraquinone; 1, 6, 8-Trihydroxy-3-methylanthraquinone; 3-Methyl-1, 6, 8-trihydroxyanthraquinone; 4, 5, 7-Trihydroxy-2-methylanthraquinone; Archin; Emodin; Emodol; Frangula emodin; Frangulic acid; NSC 408120; NSC 622947; Rheum emodin; Schuttgelb

* Herb source: Rheum palmatum L, rhe root

* Molecular formula: C₁₅H₁₀O₅

* Molecular weight: 270.23

* Physics properties: Orange needle crystal, melting point 256 - 257℃. No soluble in the water, soluble in the ethanol, slightly aether, chloroform, benzene.

* Pharmacology function: Regarded as a derivative of anthraquinone; so called from a species of rhubarb (Rheum emodei). It is used as a laxative medicine.