1,8-Dihydroxyanthraquinone-3-carboxylic acid 2-Anthracenecarboxylic acid, 9,10-dihydro-4,5-dihydroxy-9,10-dioxo- 2-Anthroic acid, 9,10-dihydro-4,5-dihydroxy-9,10-dioxo- 4,5-Dihydroxy-2-anthraquinonecarboxylic acid 4,5-Dihydroxyanthraquinone-2-carboxylic acid 478-43-3 Cassic acid Chrysazin-3-carboxylic acid Monorhein NSC38629 Rheic acid Rhein Rhubarb yellow