This chemical is called 2,4,6,8,10-Pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane, and its systematic name is Cyclopentasiloxane, 2,4,6,8,10-pentaethenyl-2,4,6,8,10-pentamethyl-. With the molecular formula of C₁₅H₃₀O₅Si₅, its molecular weight is 430.82. The CAS registry number of this chemical is 17704-22-2. 

Other characteristics of 2,4,6,8,10-Pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane can be summarised as followings: (1)#H bond acceptors: 5; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 5; (4)Polar Surface Area: 46.15 Å²; (5)Index of Refraction: 1.458; (6)Molar Refractivity: 120.78 cm³; (7)Molar Volume: 441.8 cm³; (8)Polarizability: 47.88×10^-24cm³; (9)Surface Tension: 21.2 dyne/cm; (10)Density: 0.97 g/cm³; (11)Flash Point: 129.4 °C; (12)Enthalpy of Vaporization: 52.66 kJ/mol; (13)Boiling Point: 307.8 °C at 760 mmHg; (14)Vapour Pressure: 0.00129 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. Wear suitable protective clothing, gloves and eye/face protection when you use it. In case of contacting 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](O[Si](O[Si](O[Si](O[Si]1(\C=C)C)(\C=C)C)(\C=C)C)(\C=C)C)(\C=C)C
2.InChI: InChI=1/C15H30O5Si5/c1-11-21(6)16-22(7,12-2)18-24(9,14-4)20-25(10,15-5)19-23(8,13-3)17-21/h11-15H,1-5H2,6-10H3
3.InChIKey: ZBXBDQPVXIIXJS-UHFFFAOYAL
4.Std. InChI: InChI=1S/C15H30O5Si5/c1-11-21(6)16-22(7,12-2)18-24(9,14-4)20-25(10,15-5)19-23(8,13-3)17-21/h11-15H,1-5H2,6-10H3
5.Std. InChIKey: ZBXBDQPVXIIXJS-UHFFFAOYSA-N