The CAS register number of Octakis(dimethylsiloxy)-T8-silsequioxane is 125756-69-6. It also can be called as Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane,1,3,5,7,9,11,13,15-octakis[(dimethylsilyl)oxy]- and the systematic name about this chemical is 1,3,5,7,9,11,13,15-octakis[(dimethylsilyl)oxy]pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane. The molecular formula about this chemical is C₁₆H₅₆O₂₀Si₁₆ and molecular weight is 1017.98.

Physical properties about Octakis(dimethylsiloxy)-T8-silsequioxane are: (1)#H bond acceptors: 20; (2)#Freely Rotating Bonds: 16; (3)Polar Surface Area: 184.6Ų; (4)Flash Point: 238.2 °C; (5)Enthalpy of Vaporization: 70.47 kJ/mol; (6)Boiling Point: 470.2 °C at 760 mmHg; (7)Vapour Pressure: 1.46E-08 mmHg at 25°C.

When you are using this chemical, please be cautious about it as the following:
This chemical is irritating to eyes, respiratory system and skin. When you are using it, wear suitable protective clothing. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: O1[Si]5(O[SiH](C)C)O[Si]3(O[SiH](C)C)O[Si]4(O[SiH](C)C)O[Si](O[SiH](C)C)(O[Si]2(O[Si](O[Si](O[Si]1(O[SiH](C)C)O2)(O[SiH](C)C)O3)(O[SiH](C)C)O4)O[SiH](C)C)O5
(2)InChI: InChI=1/C16H56O20Si16/c1-37(2)17-45-25-46(18-38(3)4)28-49(21-41(9)10)30-47(26-45,19-39(5)6)32-51(23-43(13)14)33-48(27-45,20-40(7)8)31-50(29-46,22-42(11)12)35-52(34-49,36-51)24-44(15)16/h37-44H,1-16H3
(3)InChIKey: IZXLUEMTVRPVBL-UHFFFAOYAZ
(4)Std. InChI: InChI=1S/C16H56O20Si16/c1-37(2)17-45-25-46(18-38(3)4)28-49(21-41(9)10)30-47(26-45,19-39(5)6)32-51(23-43(13)14)33-48(27-45,20-40(7)8)31-50(29-46,22-42(11)12)35-52(34-49,36-51)24-44(15)16/h37-44H,1-16H3
(5)Std. InChIKey: IZXLUEMTVRPVBL-UHFFFAOYSA-N