The Dimethoxymethyloctadecylsilane, with the CAS registry number 70851-50-2, is also known as Octadecylmethyldimethoxysilane. It belongs to the product categories of Alkoxy Silanes; Hydrophobing Agents. Its EINECS registry number is 274-936-5. This chemical's molecular formula is C₂₁H₄₆O₂Si and molecular weight is 358.67. Its IUPAC name is called dimethoxy-methyl-octadecylsilane. This chemical is colorless transparent liquid.

Physical properties about this chemical are: (1)ACD/LogP: 8.58; (2)# of Rule of 5 Violations: 1; (3)ACD/LogD (pH 5.5): 8.58; (4)ACD/LogD (pH 7.4): 8.58; (5)ACD/BCF (pH 5.5): 1000000; (6)ACD/BCF (pH 7.4): 1000000; (7)ACD/KOC (pH 5.5): 1108296.13; (8)ACD/KOC (pH 7.4): 1108296.13; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 19; (12)Index of Refraction: 1.439; (13)Molar Refractivity: 111.54 cm³; (14)Molar Volume: 423.6 cm³; (15)Surface Tension: 27 dyne/cm; (16)Density: 0.846 g/cm³; (17)Melting Point: 18 °C; (18)Flash Point: 211.1 °C; (19)Enthalpy of Vaporization: 57.22 kJ/mol; (20)Boiling Point: 351 °C at 760 mmHg; (21)Vapour Pressure: 8.55E-05 mmHg at 25°C.

When you are using  Dimethoxymethyloctadecylsilane, please be cautious about it as the following:
This chemical may cause inflammation to the skin or other mucous membranes. It is irritating to eyes, respiratory system and skin. In case of contact with eyes, you should rinse immediately with plenty of water and seek medical advice. Whenever you will contact it, please wear suitable gloves and eye/face protection.

You can still convert the following datas into molecular structure:
(1)Canonical SMILES: CCCCCCCCCCCCCCCCCC[Si](C)(OC)OC
(2)InChI: InChI=1S/C21H46O2Si/c1-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-24(4,22-2)23-3/h5-21H2,1-4H3
(3)InChIKey: UBCPEZPOCJYHPM-UHFFFAOYSA-N