Thieno[3,4-b]-1,4-dioxin,2,3-dihydro-

IUPAC Name: 2,3-Dihydrothieno[3,4-b][1,4]dioxine
Following is the structure of 3,4-Ethylenedioxythiophene (CAS NO.126213-50-1):
                     
Molecular Formula: C₆H₆O₂S
Formula Weight: 142.18
Index of Refraction: 1.57
Molar Refractivity: 35.41 cm³
Molar Volume: 107.8 cm³
Density: 1.318 g/cm³
Flash Point: 81.1 °C
Polarizability: 14.03 10^-24cm³
Surface Tension: 49.3 dyne/cm
Enthalpy of Vaporization: 42.86 kJ/mol
Boiling Point: 210.5 °C at 760 mmHg
Vapour Pressure: 0.278 mmHg at 25 °C 
Product Categories of 3,4-Ethylenedioxythiophene (CAS NO.126213-50-1): Thiophenes; Sulphur Derivatives; Thiophens; Thiophen
Canonical SMILES: C1COC2=CSC=C2O1
InChI: InChI=1S/C6H6O2S/c1-2-8-6-4-9-3-5(6)7-1/h3-4H,1-2H2
InChIKey: GKWLILHTTGWKLQ-UHFFFAOYSA-N

Hazard Codes: Xn,Xi
Risk Statements: 21/22-36 
R21/22:Harmful in contact with skin and if swallowed. 
R36:Irritating to eyes.
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
RIDADR: UN 2810 6.1/PG 3
WGK Germany: 2

 3,4-Ethylenedioxythiophene , its cas register number 126213-50-1. It also can be called 2,3-Dihydrothieno[3,4-b][1,4]dioxin ; 2,3-Dihydrothieno[3,4-b][1,4]dioxine ; and 2,3-Dihydro-thieno[3,4-b][1,4]dioxine . Its classification code are TSCA Flag P [A commenced PMN (Premanufacture Notice) substance] and TSCA Flag S [Substance is identified in a proposed or final SNUR (Significant New Use Rule) under TSCA] .