2-[(6-carboxy-2,3,4-trihydroxy-phenyl)methyl]-3,4,5-trihydroxy-benzoic acid;2,2'-Methylenebis[3,4,5-trihydroxybenzoic acid];Methylenedigallic acid;2-[(6-carboxy-2,3,4-trihydroxyphenyl)methyl]-3,4,5-trihydroxybenzoic acid;2-(6-carboxy-2,3,4-trihydroxy-benzyl)-3,4,5-trihydroxy-benzoic acid;3,3',4,4',5,5'-hexahydroxy-2,2'-methylenedi(benzoic acid); 

scopoline;