3,3'-Di-O-methylquercetin 3,3'-Dimethoxyquercetin 3,3'-Dimethylquercetin 4382-17-6 4H-1-Benzopyran-4-one, 5,7-dihydroxy-2-(4-hydroxy-3-methoxyphenyl)-3-methoxy- (9CI) 4H-1-Benzoyran-4-one, 5,7-dihydroxy-2-(4-hydroxy-3-methoxyphenyl)-3-methoxy- Flavone, 4',5,7-trihydroxy-3,3'-dimethoxy- (8CI) NSC 254669 Quercetin 3,3'-dimethyl ether Quercetin-3,3'-dimethylether Quercetin-3,3-dimethyl ether