2-(Bis(3-carboxy-2,5-dihydroxyphenyl)methyl)-3,4,5-trihydroxybenzoic acid homopolymer Benzoic acid, 2-(bis(3-carboxy-2,5-dihydroxyphenyl)methyl)-3,4,5-trihydroxy-, homopolymer DG4415500 Digentisic-gallic acid, polycondensed