SMILES: C1[C@@H]([C@H](OC2=C1C(=C(C(=C2)O)[C@H]3[C@@H]([C@H](OC4=CC(=CC(=C34)O)O)C5=CC(=C(C=C5)O)O)O)O)C6=CC(=C(C=C6)O)O)O
Description: The molecule is a proanthocyanidin consisting of two molecules of (+)-catechin joined by a bond between positions 4 and 6' in alpha-configuration. Procyanidin B6 is isolated from leaves and fruit of cowberry Vaccinium vitis-idaea and other plants. It can also be found in grape seeds and in beer. It has a role as a metabolite. It is a hydroxyflavan, a proanthocyanidin and a biflavonoid. It derives from a (+)-catechin.