Gallic acid: Gallic acid (3,4,5-trihydroxybenzoic acid) is an aromatic organic compound, one of the six isomers of trihydroxybenzoic acid, widely distributed in plants either in free form or as a component of gallo- tannins.
It is classified as an acid-phenol (or phenolic acid) since it has both a carboxylic function and phenolic hydroxyls.
And since it is derived from benzoic acid, it is also classified as hydroxybenzoic acid...
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