Synonyms: [4,8'-Bi-2H-1-benzopyran]-3,3',5,5',7,7'-hexol,2,2'-bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-, [2R-[2a,3b,4a(2'R*,3'R*)]]-; [4,8''-Biflavan]-3,3',3'',3''',4',4''',5,5'',7,7''-decol,stereoisomer (8CI); (+)-Catechin-(4a®8)-(-)-epicatechin; (-)-Procyanidin B4; Catechin-(4a®8)-epicatechin; Procyanidin B4;Procyanidol B4