Methylenedigallic acid

2,2'-Methylenebis[3,4,5-trihydroxybenzoic acid]

3,3',4,4',5,5'-hexahydroxy-2,2'-methylenedi(benzoic acid)

2-(6-carboxy-2,3,4-trihydroxy-benzyl)-3,4,5-trihydroxy-benzoic acid

2-[(6-carboxy-2,3,4-trihydroxyphenyl)methyl]-3,4,5-trihydroxybenzoic acid

2-[(6-carboxy-2,3,4-trihydroxy-phenyl)methyl]-3,4,5-trihydroxy-benzoic acid