IUPAC Name: 12,13-dimethoxynaphtho[1,2-b]phenanthrene 
Empirical Formula: C₂₄H₁₈O₂
Molecular Weight: 338.3985g/mol
Structure of 5,6-Dimethoxydibenz(a,h)anthracene (CAS NO.63040-49-3):

Index of Refraction: 1.744
Molar Refractivity: 110.98 cm³
Molar Volume: 273.9 cm³
Polarizability: 43.99×10^-24cm³
Surface Tension: 52.1 dyne/cm
Density: 1.235 g/cm³
Flash Point: 230.8 °C
Enthalpy of Vaporization: 82.02 kJ/mol
Boiling Point: 567.5 °C at 760 mmHg
Vapour Pressure: 2.61E-12 mmHg at 25°C 
Classification Code: Tumor data 
Canonical SMILES: COC1=C(C2=C(C=C3C=CC4=CC=CC=C4C3=C2)C5=CC=CC=C51)OC
InChI: InChI=1S/C24H18O2/c1-25-23-19-10-6-5-9-18(19)21-13-16-12-11-15-7-3-4-8-17(15)20(16)14-22(21)24(23)26-2/h3-14H,1-2H3
InChIKey: CTLSVZBGALBGBV-UHFFFAOYSA-N

Questionable carcinogen with experimental neoplastigenic and tumorigenic data. When heated to decomposition it emits acrid smoke and irritating fumes.

   5,6-Dimethoxydibenz(a,h)anthracene , its cas register number is 63040-49-3. It also can be called 3,4-Dimethoxy-1,2:5,6-dibenzanthracene ; 3,4-Dimethoxy-dba ; 4-06-00-07046 (Beilstein Handbook Reference) ; BRN 3427604 .