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(2R,2'R,3R,3'R,4R)-2,2'-bis-(3,4-Dihydroxyphenyl)-3,3',4,4'-tetrahydro-2H,2'h-4,8'-bichromene-3,3',5,5',7,7'-hexol | (2R,2'R,3R,3'R,4R)-2,2'-bis-(3,4-Dihydroxyphenyl)-[4,8'-bichromane]-3,3',5,5',7,7'-hexaol | (2R.2'R,3R,3'R,4R)-2,2'-Bis-(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-4,8'-bi-2H-1-benzopyran-3,3',5,5',7,7'-hexol and Procyanidin B2
