Synonyms: Benzoicacid, 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'-diylester, [2R-[2a,3a,4b(2'R*,3'R*)]]-; (-)-Epicatechin-3-O-galloyl-(4b,8)-(-)-epicatechin-3-O-gallate;(2R,3R)-3-O-Galloylepicatechin-4b,8-[(2R,3R)-3-O-galloylepicatechin]; 3,3'-Digalloylprocyanidin B2;Proanthocyanidin B2 3,3'-O-gallate; Procyanidin B2 3,3'-di-O-gallate;[3-O-Galloyl]-(-)-epicatechin-(4b,8)-(+)-epicatechin-3-O-gallate