3,5-Dihydroxybenzoic acid

3,5-Dihydroxybenzoic acid
Names
	Preferred IUPAC name 3,5-Dihydroxybenzoic acid
	Other names α-Resorcylic acid
Identifiers
CAS Number	99-10-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:39912;
ChEMBL	ChEMBL95308 ;
ChemSpider	7146 ;
ECHA InfoCard	100.002.482
EC Number	202-730-7;
IUPHAR/BPS	5783;
PubChem CID	7424;
UNII	2WC5LMO6L1 ;
CompTox Dashboard (EPA)	DTXSID8059184 ;
	InChI InChI=1S/C7H6O4/c8-5-1-4(7(10)11)2-6(9)3-5/h1-3,8-9H,(H,10,11) Key: UYEMGAFJOZZIFP-UHFFFAOYSA-N ;
	SMILES C1=C(C=C(C=C1O)O)C(=O)O;
Properties
Chemical formula	C7H6O4
Molar mass	154.121 g·mol−1
Melting point	235.3 °C (455.5 °F; 508.4 K)
Acidity (pKa)	4.04
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Related compounds
Related compounds	Gallic acid; 4-Hydroxybenzoic acid; Phloroglucinol
	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

3,5-Dihydroxybenzoic acid (α-resorcylic acid) is a dihydroxybenzoic acid. It is a colorless solid.