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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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