... HPLCCAS No.: 478-43-3Synonyms 4,5-Dihydroxyanthraquinone-2-carboxylic acid; 1,8-Dihydroxy-3-carboxyanthraquinone; 9,10-Dihydro-4 ... ,5-dihydroxy-9,10-dioxo-2-anthracenecarboxylic acid; Rhubarb yellow; Cassic acidMolecular formula: C15H8O6 Molecular weight: ... .Hardly soluble in the water, soluble in the ethanol, benzene, chloroform, aether etc.[Physics Properties]:Orange needle [Inner packing ...