The Silicic acid (H₄SiO₄),tetra(ethyl-d₅) ester (9CI), with the CAS registry number 272778-10-6, has the systematic name of Tetrakis[(²H₅)ethyl] orthosilicate. It is a kind of organics, and should be stored in the dry and cool environment. And the molecular formula of the chemical is C₈D₂₀O₄Si.

The characteristics of Silicic acid (H₄SiO₄),tetra(ethyl-d₅) ester (9CI) are as followings: (1)ACD/LogP: 3.81; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.811; (4)ACD/LogD (pH 7.4): 3.811; (5)ACD/BCF (pH 5.5): 464.124; (6)ACD/BCF (pH 7.4): 464.124; (7)ACD/KOC (pH 5.5): 2820.851; (8)ACD/KOC (pH 7.4): 2820.851; (9)#H bond acceptors: 4; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 8; (12)Polar Surface Area: 36.92 Å²; (13)Index of Refraction: 1.409; (14)Molar Refractivity: 54.81 cm³; (15)Molar Volume: 221.776 cm³; (16)Polarizability: 21.728×10^-24cm³; (17)Surface Tension: 23.493 dyne/cm; (18)Density: 1.03 g/cm³; (19)Flash Point: 46.667 °C; (20)Enthalpy of Vaporization: 38.547 kJ/mol; (21)Boiling Point: 165.499 °C at 760 mmHg; (22)Vapour Pressure: 2.456 mmHg at 25°C. 

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: [2H]C([2H])([2H])C([2H])([2H])O[Si](OC([2H])([2H])C([2H])([2H])[2H])(OC([2H])([2H])C([2H])([2H])[2H])OC([2H])([2H])C([2H])([2H])[2H]
(2)InChI: InChI=1/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3/i1D3,2D3,3D3,4D3,5D2,6D2,7D2,8D2
(3)InChIKey: BOTDANWDWHJENH-DEHFLJNXER