IUPAC Name: 2-diphenylarsanylethyl(diphenyl)arsane 
Empirical Formula: C₂₆H₂₄As₂
Molecular Weight: 486.312g/mol
EINECS: 224-629-7
Flash Point: 270.7 °C
Enthalpy of Vaporization: 76.47 kJ/mol
Boiling Point: 521.4 °C at 760 mmHg
Vapour Pressure: 1.88E-10 mmHg at 25°C
Canonical SMILES: C1=CC=C(C=C1)[As](CC[As](C2=CC=CC=C2)C3=CC=CC=C3)C4=CC=CC=C4
InChI: InChI=1S/C26H24As2/c1-5-13-23(14-6-1)27(24-15-7-2-8-16-24)21-22-28(25-17-9-3-10-18-25)26-19-11-4-12-20-26/h1-20H,21-22H2
InChIKey: PZEXNMSXAVGEAP-UHFFFAOYSA-N
Structure of  Ethylenebis(diphenylarsine) (CAS NO.4431-24-7):

Hazard Codes: T,N
Risk Statements: 23/25-50/53 
R23/25:Toxic by inhalation and if swallowed. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 20/21-28-45-60-61 
S20:When using, do not eat or drink. 
S21:When using do not smoke. 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 3465 6.1/PG 2
WGK Germany: 3
RTECS: CH6700000
HazardClass: 6.1(b)
PackingGroup: III
Poison by intravenous route. An irritant. When heated to decomposition it emits toxic fumes of As.

OSHA PEL: TWA 0.5 mg(As)/m³

  Ethylenebis(diphenylarsine) , its cas register number is 4431-24-7. It also can be called 3-16-00-00924 (Beilstein Handbook Reference) ; BRN 2950878 ; EINECS 224-629-7 . It is very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. And it's also to people if swallowed. Do not eat and smoke when using Ethylenebis(diphenylarsine) (CAS NO.4431-24-7). After contact with skin, wash immediately with plenty of soap-suds. In case of accident or if you feel unwell, seek medical advice immediately.