(4,6'-Bi-2H-1-benzopyran)-3,3',5,5',7,7'-hexol, 2,2'-bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-, (2R-(2-alpha,3-alpha,4-beta(2'R*,3'R*)))- 12798-57-1 5-19-03-00736 (Beilstein Handbook Reference) BRN 3586526 Proanthocyanidin B5 Procyanidin B5 Procyanidol B5