Aromatic acid

Aromatic acids are a type of aromatic compound. Included in that class are substances containing an aromatic ring and an organic acid functional group. There are several categories of aromatic acids including:

* Phenolic acids: substances containing an aromatic ring and an organic carboxylic acid function (C6-C1 skeleton).
* Aromatic amino acids[1]

## References

1. ↑ "Carboxylic acid - Aromatic, Organic, Reactions | Britannica" (in en). https://www.britannica.com/science/carboxylic-acid/Aromatic-acids.

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Aromatic acids

Phenolic acids|

| Monohydroxybenzoic acids|

| Aglycones|

* 3-Hydroxybenzoic acid
* 4-Hydroxybenzoic acid
* Salicylic acid

|

Glycosides|

* p-Hydroxybenzoic acid glucoside

Dihydroxybenzoic acids|

* 2,3-Dihydroxybenzoic acid (Hypogallic acid)
* 2,4-Dihydroxybenzoic acid
* 2,6-Dihydroxybenzoic acid
* 3,5-Dihydroxybenzoic acid
* Ethyl protocatechuate
* Gentisic acid
* Homogentisic acid
* Orsellinic acid
* Protocatechuic acid

Trihydroxybenzoic acids|

* Bergenin
* Chebulic acid
* Ethyl gallate
* Eudesmic acid
* Gallic acid
* Tannic acid
* Norbergenin
* Phloroglucinol carboxylic acid
* Syringic acid
* Theogallin

Other phenolic acids|

* Vanillin
* Ellagic acid

Hydroxycinnamic acids|

* α-Cyano-4-hydroxycinnamic acid
* Caffeic acid
* Chicoric acid
* Cinnamic acid
* Chlorogenic acid
* Diferulic acids
* Coumaric acid
* Coumarin
* Ferulic acid
* Sinapinic acid

Aromatic amino acids|

* phenylalanine
* tryptophan
* histidine
* tyrosine
* thyroxine
* 5-hydroxytryptophan
* L-DOPA

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