Dihydroxybenzoic acid

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.

Phenolic acids (C6-C1) and their glycosides

Glycosides	p-Hydroxybenzoic acid glucoside

Acetylated	Methylparaben (Methyl p-hydroxybenzoic acid)

Dihydroxybenzoic acids

2,3-Dihydroxybenzoic acid (Hypogallic acid)
2,4-Dihydroxybenzoic acid
2,5-Dihydroxybenzoic acid (Gentisic acid)
2,6-Dihydroxybenzoic acid
3,4-Dihydroxybenzoic acid (Protocatechuic acid)
3,5-Dihydroxybenzoic acid

Acetylated	Ethyl protocatechuate Orsellinic acid

Trihydroxybenzoic acids

Glycosides	Bergenin Norbergenin Theogallin Chebulic acid

Acetylated	Ethyl gallate Eudesmic acid Methyl gallate Syringic acid

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