Following is the structure of N,N,N',N'-Tetrakis(4-methylphenyl)-benzidine (CAS NO.76185-65-4):
                         
Empirical Formula: C₄₀H₃₆N₂
Molecular Weight: 544.7272 
Index of Refraction: 1.659
Molar Refractivity: 177.832 cm³
Molar Volume: 482.139 cm³  
Density: 1.13 g/cm³
Melting point: 218 °C
Flash Point: 310.749 °C
Surface Tension: 48.61 dyne/cm
Enthalpy of Vaporization: 102.71 kJ/mol
Boiling Point of N,N,N',N'-Tetrakis(4-methylphenyl)-benzidine (CAS NO.76185-65-4): 701.741 °C at 760 mmHg
Product Categories of N,N,N',N'-Tetrakis(4-methylphenyl)-benzidine (CAS NO.76185-65-4): electronic; Electronic Chemicals; Electroluminescence; Functional Materials; Pale-White Powder
SMILES: c6c(N(c4ccc(c3ccc(N(c1ccc(cc1)C)c2ccc(cc2)C)cc3)cc4)c5ccc(cc5)C)ccc(c6)C
InChI: InChI=1/C40H36N2/c1-29-5-17-35(18-6-29)41(36-19-7-30(2)8-20-36)39-25-13-33(14-26-39)34-15-27-40(28-16-34)42(37-21-9-31(3)10-22-37)38-23-11-32(4)12-24-38/h5-28H,1-4H3
InChIKey: MVIXNQZIMMIGEL-UHFFFAOYAW

 N,N,N',N'-Tetrakis(4-methylphenyl)-benzidine , its cas register number is 76185-65-4. It also can be called N,N,N',N'-tetra(4-methylphenyl)-1,1'-biphenyl-4,4'-diamine ; and [1,1'-biphenyl]-4,4'-diamine, N~4~,N~4~,N~4'~,N~4'~-tetrakis(4-methylphenyl)- .