2,4-Dihydroxybenzoic acid

2,4-Dihydroxybenzoic acid
Names
	Preferred IUPAC name 2,4-Dihydroxybenzoic acid
	Other names β-Resorcylic acid; β-Resorcinolic acid; p-Hydroxysalicylic acid; 2,4-DHBA
Identifiers
CAS Number	89-86-1 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL328910 ;
ChemSpider	1446 ;
DrugBank	DB02839 ;
ECHA InfoCard	100.001.770
PubChem CID	1491;
UNII	LU39SC9JYL ;
CompTox Dashboard (EPA)	DTXSID0025074 ;
	InChI InChI=1S/C7H6O4/c8-4-1-2-5(7(10)11)6(9)3-4/h1-3,8-9H,(H,10,11) Key: UIAFKZKHHVMJGS-UHFFFAOYSA-N ;
	SMILES C1=CC(=C(C=C1O)O)C(=O)O;
Properties
Chemical formula	C7H6O4
Molar mass	154.12 g/mol
Melting point	229 °C (444 °F; 502 K)
Acidity (pKa)	3.11, 8.55, 14.0
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P280, P302+P352, P305+P351+P338
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

2,4-Dihydroxybenzoic acid (Resochin, sontochin, SN-7619, β-resorcylic acid) is a dihydroxybenzoic acid.

As a resorcylic acid, it is one of the three isomeric crystalline acids that are both carboxyl derivatives of resorcinol and dihydroxy derivatives of benzoic acid. Synthesis from resorcinol is via the Kolbe-Schmitt reaction.

It is a degradation product of cyanidin glycosides from tart cherries in cell cultures. It is also a metabolite found in human plasma after cranberry juice consumption.

Resochin is especially effective against avian malaria. Because the initial testing during the chemical development process used avian malaria its efficacy was recognised immediately.

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