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Chemical structure of tannic acid (CAS 1401–55-4, C76H52O46). TA consists of a glucose core, which covalently connects to 3–5 gallic acid (3,4,5-trihydroxyl benzoic acid) residues through ester bonds. Each gallate residue can covalently link to other gallic acid molecules. Thus, TA is referred to as a glucoside polymer of gallic acid.
