Synonyms: 3,3'-di-O-methylquercetin;2-(3-Methoxy-4-hydroxyphenyl)-3-methoxy-5,7-dihydroxy-4H-1-benzopyran-4-one;2-(4-Hydroxy-3-methoxyphenyl)-3-methoxy-5,7-dihydroxy-4H-1-benzopyran-4-one;3,3'-Dimethoxy-4',5,7-trihydroxyflavone;4',5,7-Trihydroxy-3,3'-dimethoxyflavone