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Dihydroxybenzoic acids (DHBA) are a type of phenolic acids.

There are six main compounds, having all the same molecular formula C₇H₆O₄. Those are:

* 2,3-Dihydroxybenzoic acid (2-Pyrocatechuic acid or hypogallic acid)
* 2,4-Dihydroxybenzoic acid (?-Resorcylic acid)
* 2,5-Dihydroxybenzoic acid

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