3,3'-Diaminobenzidine

3,3′-Diaminobenzidine
Names
	Preferred IUPAC name [1,1′-Biphenyl]-3,3′,4,4′-tetramine
	Other names 3,3′,4,4′-Biphenyltetramine; 3,3′,4,4′-Tetraamino-diphenyl
Identifiers
CAS Number	91-95-2 [chemspider]; 7411-49-6 (4HCl) ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1212988
ChEBI	CHEBI:90994 ;
ChEMBL	ChEMBL1396955;
ChemSpider	6804 ;
ECHA InfoCard	100.001.919
EC Number	202-110-6;
PubChem CID	7071;
RTECS number	DV8750000; DV8753000 (4HCl);
UNII	2RV4T6KHQI ; 26I0SJP460 (4HCl) ;
UN number	2811
CompTox Dashboard (EPA)	DTXSID2036827 ;
	InChI InChI=1S/C12H14N4/c13-9-3-1-7(5-11(9)15)8-2-4-10(14)12(16)6-8/h1-6H,13-16H2 Key: HSTOKWSFWGCZMH-UHFFFAOYSA-N ; InChI=1/C12H14N4/c13-9-3-1-7(5-11(9)15)8-2-4-10(14)12(16)6-8/h1-6H,13-16H2 Key: HSTOKWSFWGCZMH-UHFFFAOYAU;
	SMILES c2(c1cc(N)c(N)cc1)ccc(N)c(N)c2;
Properties
Chemical formula	C12H14N4; C12H18Cl4N4 (4HCl)
Molar mass	214.27 g/mol; 360.11 g/mol (4HCl)
Melting point	175 to 177 °C (347 to 351 °F; 448 to 450 K) (280 °C for 4HCl.2H2O)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H341, H350
Precautionary statements	P201, P202, P281, P308+P313, P405, P501
NFPA 704 (fire diamond)	2 1 2
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	mouse, oral Acute: 1834 mg/kg.
Safety data sheet (SDS)	External MSDS
	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

3,3′-Diaminobenzidine (DAB) is an organic compound with the formula (C₆H₃(NH₂)₂)₂. This derivative of benzidine is a precursor to polybenzimidazole, which forms fibers that are renowned for their chemical and thermal stability. As its water-soluble tetrahydrochloride, DAB has been used in immunohistochemical staining of nucleic acids and proteins.