Caffeic acid

Caffeic acid
Names
	IUPAC names 3-(3,4-Dihydroxyphenyl)-2-propenoic acid; 3,4-Dihydroxycinnamic acid; trans-Caffeate; 3,4-Dihydroxy-trans-cinnamate; (E)-3-(3,4-dihydroxyphenyl)-2-propenoic acid; 3,4-Dihydroxybenzeneacrylicacid; 3-(3,4-Dihydroxyphenyl)-2-propenoic acid
	Preferred IUPAC name (2E)-3-(3,4-Dihydroxyphenyl)prop-2-enoic acid
Identifiers
CAS Number	501-16-6 ; 331-39-5 (non-specific) ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1954563
ChEBI	CHEBI:16433 ;
ChEMBL	ChEMBL145 ;
ChemSpider	600426 ;
DrugBank	DB01880 ;
ECHA InfoCard	100.005.784
EC Number	206-361-2;
IUPHAR/BPS	5155;
KEGG	C01481 ;
PubChem CID	689043;
UNII	U2S3A33KVM ;
CompTox Dashboard (EPA)	DTXSID5020231 ;
	InChI InChI=1S/C9H8O4/c10-7-3-1-6(5-8(7)11)2-4-9(12)13/h1-5,10-11H,(H,12,13)/b4-2+ Key: QAIPRVGONGVQAS-DUXPYHPUSA-N ; InChI=1/C9H8O4/c10-7-3-1-6(5-8(7)11)2-4-9(12)13/h1-5,10-11H,(H,12,13)/b4-2+ Key: QAIPRVGONGVQAS-DUXPYHPUBE;
	SMILES O=C(O)\C=C\c1cc(O)c(O)cc1;
Properties
Chemical formula	C9H8O4
Molar mass	180.16 g/mol
Density	1.478 g/cm3
Melting point	223 to 225 °C (433 to 437 °F; 496 to 498 K)
UV-vis (λmax)	327 nm and a shoulder at c. 295 nm in acidified methanol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335, H351, H361
Precautionary statements	P201, P202, P261, P264, P271, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
NFPA 704 (fire diamond)	1 1 0
Related compounds
Related compounds	Chlorogenic acid; Cichoric acid; Coumaric acid; Quinic acid
	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

Caffeic acid is an organic compound that is classified as a hydroxycinnamic acid. This yellow solid consists of both phenolic and acrylic functional groups. It is found in all plants because it is an intermediate in the biosynthesis of lignin, one of the principal components of woody plant biomass and its residues.

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