.beta.-Rhamnocitrin 3,3',4',5-Tetrahydroxy-7-methoxyflavone 4H-1-Benzopyran-4-one, 2-(3,4-dihydroxyphenyl)-3,5-dihydroxy-7-methoxy- 7-Methoxyquercetin 7-Methylquercetin 7-O-Methylquercetin 90-19-7 C.I. 75690 Flavone, 3,3',4',5-tetrahydroxy-7-methoxy- NSC19802 Quercetin 7-methyl ether RHAMNETIN