IUPAC Name: 1,3-dimethylimidazolidin-2-one 
Empirical Formula: C₅H₁₀N₂O
Molecular Weight: 114.1457g/mol
EINECS: 201-304-8 
Structure of 1,3-Dimethyl-2-imidazolidinone (CAS NO.80-73-9):

Index of Refraction: 1.48
Molar Refractivity: 30.51 cm³
Molar Volume: 107.3 cm³
Polarizability: 12.09×10^-24cm³
Surface Tension: 33.6 dyne/cm
Density: 1.063 g/cm³
Flash Point: 76.5 °C
Enthalpy of Vaporization: 45.67 kJ/mol 
Melting Point: 8.2 °C
Boiling Point: 220.3 °C at 760 mmHg
Vapour Pressure: 0.114 mmHg at 25°C 
Water Solubility: freely soluble
Sensitive: Hygroscopic
Product Categories: Imidazol&Benzimidazole;Heterocyclic Compounds 
Canonical SMILES: CN1CCN(C1=O)C
InChI: InChI=1S/C5H10N2O/c1-6-3-4-7(2)5(6)8/h3-4H2,1-2H3
InChIKey: CYSGHNMQYZDMIA-UHFFFAOYSA-N

  1,3-Dimethyl-2-imidazolidinone (CAS NO.80-73-9) is used as an aprotic solvent. It is also used in a variety of applications including detergents, dyestuffs, electronic materials and in the manufacture of polymers. In many applications, it is a suitable replacement for the carcinogenic solvent HMPA.

Hazard Codes:  Xn,Xi
The Risk Statements information of 1,3-dimethyl-2-imidazolidinone:
38:  Irritating to the skin 
41:  Risk of serious damage to eyes 
21/22:  Harmful in contact with skin and if swallowed 
36/38:  Irritating to eyes and skin 
The Safety Statements information of 1,3-dimethyl-2-imidazolidinone:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 
36:  Wear suitable protective clothing 
36/37/39:  Wear suitable protective clothing, gloves and eye/face protection 
RIDADR:UN 2810 6.1/PG 3
WGK Germany:3
RTECS:NJ0660000
F:3

 1,3-Dimethyl-2-imidazolidinone , its cas register number is 80-73-9. It also can be called 1,3-Dimethylethyleneurea ; 5-24-01-00054 (Beilstein Handbook Reference) ; Karbomos TsEM ; N,N'-Dimethylethyleneurea ; N,N'-Dimethylimidazolidinone ;
 N,N'-Dimethylimidazolidone ; Rhonite 1 . 1,3-Dimethyl-2-imidazolidinone (CAS NO.80-73-9) is a almost colorless, clear liquid.