Synonyms: Flavone,5-hydroxy-3,3',4',7-tetramethoxy- (7CI,8CI); 3,3',4',7-Tetra-O-methylquercetin;3,3',4',7-Tetramethylquercetin; 5-Hydroxy-3,3',4',7-tetramethoxyflavone;5-Hydroxy-3,7,3',4'-tetramethoxyflavone; NSC 61837; NSC 618937; Quercetin3,3',4',7-O-tetramethyl ether; Quercetin 3,7,3',4'-tetramethyl ether; Retusin;Retusin (Ariocarpus); Retusine