Dihydroxybenzoic acid

Updated on Nov 09, 2023

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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 (β-Resorcylic acid)

2,5-Dihydroxybenzoic acid (Gentisic acid)

2,6-Dihydroxybenzoic acid (γ-Resorcylic acid)

3,4-Dihydroxybenzoic acid (Protocatechuic acid)

3,5-Dihydroxybenzoic acid (α-Resorcylic acid)

Orsellinic acid is also a dihydoxybenzoic acid having an extra methyl group.

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