オンブイン

Also known as 7,4'-di-O-methylquercetin, 4',7-dimethoxy-3,3',5-trihydroxyflavone, 3,5-dihydroxy-2-(3-hydroxy-4-methoxyphenyl)-7-methoxy-4H-1-benzopyran-4-one

Ombuin is an O-methylated flavonol, a type of flavonoid. It is the 4',7-O-methyl derivative of quercetin.