4,5-dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid-13C4; 9,10-Dihydro-4,5-dihydroxy-9,10-dioxo-2-anthracenecarboxylic Acid-13C4;4,5-Dihydroxy-2-anthraquinonecarboxylic Acid-13C4; Chrysazin-3-carboxylic Acid-13C4; Monorhein-13C4; NSC 38629-13C4; Rheic Acid-13C4; Rhubarb Yellow-13C4; Diacerein Impurity C
