The Selenium,dichlorodiphenyl-, (T-4)-, with the CAS registry number of 2217-81-4, is also known as Diphenylselenium dichloride,97%. This chemical's molecular formula is C₁₂H₁₀Cl₂Se and molecular weight is 304.07. What's more, its IUPAC name is [Dichloro(phenyl)-$l^{4}-selanyl]benzene. In addition, it must be stored in airtight containers and placed in a dry, cool place.

Physical properties about the Selenium,dichlorodiphenyl-, (T-4)- are: (1)#H bond acceptors: 0; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 2; (4)Polar Surface Area: 0 Ų.

When you are using this chemical, please be cautious about it as the following:
It is very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. This material and its container must be disposed of as hazardous waste. In case of accident or if you feel unwell seek medical advice immediately (show the label where possible). Besides, it is toxic by inhalation and if swallowed. In addition, when using you should not eat, drink or smoke.

You can still convert the following datas into molecular structure:
(1) SMILES: Cl[Se](Cl)(c1ccccc1)c2ccccc2
(2) InChI: InChI=1/C12H10Cl2Se/c13-15(14,11-7-3-1-4-8-11)12-9-5-2-6-10-12/h1-10H
(3) InChIKey: JNHRULRRPDYSKM-UHFFFAOYAO