2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxy-4H-2-benzopyran-6-sulfonic acid sodium salt 4H-2-Benzopyran-6-sulfonic acid, 2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-, sodium salt DJ3420000 Quercetin 6'-sodium sulfonate