79907-44-1 Benzoic acid, 3,4,5-trihydroxy-, 2,2'-bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-5,5',7,7'-tetrahydroxy(4,8'-bi-2H-1-benzopyran)-3,3'-diyl ester, (2R-(2alpha,3alpha,4beta(2'R*,3'R*)))- Procyanidin B2 3,3'-di-O-gallate