| | Identification | Back Directory |  | [Name] 
 4,4'-diamino-3,3'-biphenyldisulfonic acid
 |  | [CAS] 
 3365-90-0
 |  | [Synonyms] 
 Benzidine-3,3''-disulfonic acid
 4,4'-diamino-3,3'-biphenyldisulfonic acid
 4,4'-diaminobiphenyl-3,3'-disulphonic acid
 4,4'-Diamino-(1,1'-biphenyl)-3,3'-disulfonic acid
 [1,1'-Biphenyl]-3,3'-disulfonicacid, 4,4'-diaMino-
 2-amino-5-(4-amino-3-sulfophenyl)benzenesulfonic acid
 2-amino-5-(4-amino-3-sulfo-phenyl)benzenesulfonic acid
 2-azanyl-5-(4-azanyl-3-sulfo-phenyl)benzenesulfonic acid
 |  | [Molecular Formula] 
 C12H12N2O6S2
 |  | [MDL Number] 
 MFCD01026108
 |  | [MOL File] 
 3365-90-0.mol
 |  | [Molecular Weight] 
 344.36
 | 
 | Chemical Properties | Back Directory |  | [density ] 
 1.681±0.06 g/cm3(Predicted)
 |  | [pka] 
 -1.97±0.50(Predicted)
 |  | [InChI] 
 InChI=1S/C12H12N2O6S2/c13-9-3-1-7(5-11(9)21(15,16)17)8-2-4-10(14)12(6-8)22(18,19)20/h1-6H,13-14H2,(H,15,16,17)(H,18,19,20)
 |  | [InChIKey] 
 NFSOOPQRTBEFDR-UHFFFAOYSA-N
 |  | [SMILES] 
 C1(C2=CC=C(N)C(S(O)(=O)=O)=C2)=CC=C(N)C(S(O)(=O)=O)=C1
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 | Hazard Information | Back Directory |  | [Description] 
 4,4'-diamino-3,3'-biphenyldisulfonic acid is virtually insoluble in alcohol and ether, very slightly soluble in boiling water. Benzidine-3,3' -disulfonic acid is made by reacting one part of benzidine sulfate with two parts of sulfuric acid monohydrate at 210 ℃.
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