Synonyms: Trigentisic acid;Compound 21 P;21 P;3,3',3''-Methylidynetris(2,5-dihydroxybenzoic acid) homopolymer;Benzoic acid, 3,3',3''-methylidynetris(2,5-dihydroxy-, homopolymer;AC1MI9CH;LS-37895;3-[bis(3-carboxy-2,5-dihydroxyphenyl)methyl]-2,5-dihydroxybenzoic acid;52486-80-3