Molecular structure of 1,6-Hexanediol dimethacrylate (CAS NO.6606-59-3) is:

Product Name: 1,6-Hexanediol dimethacrylate
CAS Registry Number: 6606-59-3
IUPAC Name: 6-(2-methylprop-2-enoyloxy)hexyl 2-methylprop-2-enoate
Molecular Weight: 254.32208 [g/mol]
Molecular Formula: C₁₄H₂₂O₄
XLogP3-AA: 3.4
H-Bond Donor: 0
H-Bond Acceptor: 4 
EINECS: 229-551-7
Vapor pressure: 0.02 mm Hg ( 100 °C)
Refractive index: n20/D 1.458(lit.)
Surface Tension: 31.8 dyne/cm
Density: 0.991 g/cm³
Flash Point: 157.3 °C
Enthalpy of Vaporization: 57.71 kJ/mol
Boiling Point: 334.2 °C at 760 mmHg
Vapour Pressure: 0.00013 mmHg at 25°C 
Other Registry Number: 717144-09-7
Product Categories: monomer;C₁₂ to C₆₃Monomers;Acrylic Monomers;Carbonyl Compounds;Esters;Polyfunctional Acrylics

Safty information about 1,6-Hexanediol dimethacrylate (CAS NO.6606-59-3) is:
Hazard Codes: Xn,Xi
Risk Statements: 20/21/22-36/37/38 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36-37/39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S37/39:Wear suitable gloves and eye/face protection.
RIDADR: UN 3082 9/PG 3
WGK Germany: 2
F: 8-10-13-23

 1,6-Hexanediol dimethacrylate , its cas register number is 6606-59-3. It also can be called 2-Propenoic acid,2-methyl-, 1,1'-(1,6-hexanediyl) ester ; 1,6-Hexanediyl bismethacrylate ; 2-Propenoic acid, 2-methyl-, 1,6-hexanediyl ester .It is a clear liquid.