1247-97-8 3,3',4',5,7-Pentamethoxyflavone 4H-1-Benzopyran-4-one, 2-(3,4-dimethoxyphenyl)-3,5,7-trimethoxy- Flavone, 3,3',4',5,7-pentamethoxy- NSC115922 Penta-O-methylquercitin Quercetin pentamethyl ether