Molecule structure of 5,5-Bianthranilic acid (CAS NO.2130-56-5) :

IUPAC Name: 2-amino-5-(4-amino-3-carboxyphenyl)benzoic acid 
Molecular Weight: 272.25608 g/mol
Molecular Formula: C₁₄H₁₂N₂O₄
Density: 1.476 g/cm³ 
Boiling Point: 557.7 °C at 760 mmHg
Flash Point: 291.1 °C 
Molar Volume: 184.3 cm³
Water Solubility: 131 mg/L
Polarizability: 29*10^-24 cm³
Surface Tension: 83 dyne/cm 
Enthalpy of Vaporization: 88.34 kJ/mol
Vapour Pressure: 2.83E-13 mmHg at 25 °C 
Henry's Law Constant: 2.10E-20 atm-m³/mole at 25 °C
Atmospheric OH Rate Constant: 5.80E-11 cm³/molecule-sec at 25 °C
XLogP3-AA: 2.3
H-Bond Donor: 4
H-Bond Acceptor: 6
Rotatable Bond Count: 3
Tautomer Count: 3
Exact Mass: 272.079707
MonoIsotopic Mass: 272.079707
Topological Polar Surface Area: 127
Heavy Atom Count: 20
Complexity: 351
Canonical SMILES: C1=CC(=C(C=C1C2=CC(=C(C=C2)N)C(=O)O)C(=O)O)N
InChI: InChI=1S/C14H12N2O4/c15-11-3-1-7(5-9(11)13(17)18)8-2-4-12(16)10(6-8)14(19)20/h1-6H,15-16H2,(H,17,18)(H,19,20)
InChIKey: IIQLVLWFQUUZII-UHFFFAOYSA-N
EINECS: 218-348-9

Reported in EPA TSCA Inventory.

Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of NO_x.

 5,5-Bianthranilic acid (CAS NO.2130-56-5) is also called (1,1'-Biphenyl)-3,3'-dicarboxylic acid, 4,4'-diamino- ; 2-14-00-00345 (Beilstein Handbook Reference); 3,3'-Benzidinedicarboxylic acid ; 3,3'-Biphenyldicarboxylic acid, 4,4'-diamino-
3,3'-Dicarboxybenzidine ; 4,4'-Diamino-3,3'-biphenyldicarboxylic acid ; 5,5'-Dianthranilic acid .5,5-Bianthranilic acid (CAS NO.2130-56-5) is toxic. It is flammable. It will produce toxic nitrogen oxide fumes when buring. So the storage environment should be ventilate, low-temperature and dry.