IUPAC Name: 1,4,5,8-tetrachloroanthracene-9,10-dione 
Empirical Formula: C₁₄H₄C_l4O₂
Molecular Weight: 345.9924g/mol
EINECS: 201-362-4 
Structure of 1,4,5,8-Tetrachloroanthraquinone (CAS NO.81-58-3):

Index of Refraction: 1.68
Molar Refractivity: 78.24 cm³
Molar Volume: 206.8 cm³
Polarizability: 31.02×10^-24cm³
Surface Tension: 63.2 dyne/cm
Density: 1.672 g/cm³
Flash Point: 213.5 °C
Enthalpy of Vaporization: 78.15 kJ/mol
Boiling Point: 510.7 °C at 760 mmHg
Vapour Pressure: 1.52E-10 mmHg at 25°C 
Product Categories: Intermediates of Dyes and Pigments 
Canonical SMILES: C1=CC(=C2C(=C1Cl)C(=O)C3=C(C=CC(=C3C2=O)Cl)Cl)Cl
InChI: InChI=1S/C14H4Cl4O2/c15-5-1-2-6(16)10-9(5)13(19)11-7(17)3-4-8(18)12(11)14(10)20/h1-4H
InChIKey: DUJPMUKIEFLXRE-UHFFFAOYSA-N

  1,4,5,8-Tetrachloroanthraquinone , its cas register number is 81-58-3. It also can be called 1,4,5,8-Tetrachloro-9,10-anthraquinone ; NSC 513487 .