Diphenic anhydride

IUPAC Name: Benzo[d][2]benzoxepine-5,7-dione 
Following is the structure of Dibenz[c,e]oxepin-5,7-dione (CAS NO.6050-13-1):
                     
Empirical Formula: C₁₄H₈O₃
Molecular Weight: 224.2115
EINECS: 227-950-0
Index of Refraction: 1.637
Molar Refractivity: 60.27 cm³
Molar Volume: 167.8 cm³
Density: 1.335 g/cm³
Flash Point: 212 °C
Surface Tension: 54 dyne/cm
Sensitive: Moisture Sensitive
Water Solubility: decomposes
Melting point: 225-227 °C(lit.)
Enthalpy of Vaporization: 67.84 kJ/mol
Boiling Point: 424 °C at 760 mmHg
Vapour Pressure: 2.14E-07 mmHg at 25 °C 
Appearance: beige - white Crystalline Powder
Product Categories: Biphenyl derivatives; Anhydride Monomers; Monomers; Polymer Science
Canonical SMILES: C1=CC=C2C(=C1)C3=CC=CC=C3C(=O)OC2=O
InChI: InChI=1S/C14H8O3/c15-13-11-7-3-1-5-9(11)10-6-2-4-8-12(10)14(16)17-13/h1-8H
InChIKey: RTSGJTANVBJFFJ-UHFFFAOYSA-N

 Dibenz[c,e]oxepin-5,7-dione (CAS NO.6050-13-1) hasn't been listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65.

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39-7-8-24/25-37 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37/39:Wear suitable gloves and eye/face protection. 
S7:Keep container tightly closed. 
S8:Keep container dry. 
S24/25:Avoid contact with skin and eyes. 
S37:Wear suitable gloves.
WGK Germany: 3

 Dibenz[c,e]oxepin-5,7-dione , its cas register number 6050-13-1. It also can be called Diphenic anhydride ; 2,2'-Diphenyldicarboxylic anhydride ; and 2,2'-Biphenyldicarboxylic anhydride .
 Dibenz[c,e]oxepin-5,7-dione (CAS NO.6050-13-1) could be stable under normal temperatures and pressures. It should avoid the condition like incompatible materials, strong oxidants, exposure to moist air or water. It is not compatible with strong oxidizing agents, strong bases. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.  However, its hazardous polymerization has not been reported.