Molecule structure of Naphtho(1,8-gh:4,5-g'h')diquinoline (CAS NO.16566-64-6):

Molecular Weight: 304.34408 g/mol
Molecular Formula: C₂₂H₁₂N₂ 
Density: 1.404 g/cm³ 
Boiling Point: 577.9 °C at 760 mmHg 
Flash Point: 268.2 °C
Index of Refraction: 1.945
Molar Refractivity: 104.33 cm³
Molar Volume: 216.6 cm³
Polarizability: 41.36×10^-24 cm³
Surface Tension: 78.8 dyne/cm 
Enthalpy of Vaporization: 83.3 kJ/mol
Vapour Pressure: 9.43E-13 mmHg at 25 °C
XLogP3-AA: 5.6
H-Bond Acceptor: 2
Exact Mass: 304.100048
MonoIsotopic Mass: 304.100048
Topological Polar Surface Area: 25.8
Heavy Atom Count: 24
Complexity: 446 
Canonical SMILES: C1=CC2=C(C3=C4C(=C2)C=CC5=CC6=C(C(=C54)C=C3)N=CC=C6)N=C1
InChI: InChI=1S/C22H12N2/c1-3-15-11-13-5-6-14-12-16-4-2-10-24-22(16)18-8-7-17(19(13)20(14)18)21(15)23-9-1/h1-12H
InChIKey of Naphtho(1,8-gh:4,5-g'h')diquinoline (CAS NO.16566-64-6): FZCBKDCBHRBVNQ-UHFFFAOYSA-N

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

 Naphtho(1,8-gh:4,5-g'h')diquinoline (CAS NO.16566-64-6) is also named as 1,12-Diazadibenzo(a,i)pyrene ; 3,14-Diazabenzo(d,l)pyrene ; Dipyrido(2,3-d,2,3-l)pyrene .