Gentisic acid

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Gentisic acid
IUPAC name 2,5-dihydroxybenzoic acid
Other names 5-Hydroxysalicylic acid; Gentianic acid; Carboxyhydroquinone; 2,5-Dioxybenzoic Acid; Hydroquinonecarboxylic Acid
Identifiers
CAS number [490-79-9]
PubChem 3469
SMILES C1=CC(=C(C=C1O)C(=O)O)O
Properties
Molecular formula C7H6O4
Molar mass 154.12
Appearance white to yellow powder
Melting point

200 - 205 C (Sublimes)

Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Gentisic acid is an aromatic carboxylic acid used as a sample matrix in Matrix-assisted laser desorption/ionization Mass spectrometry.

As a hydroquinone, it is readily oxidised and is used as an antioxidant excipient in some pharmaceutical preparations.

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