IUPAC Name: 1-(3,4-Dihydro-2H-pyrrol-5-yl)ethanone 
Following is the structure of 1-(4,5-Dihydro-3H-pyrrol-2-yl)ethanone (CAS NO.99583-29-6):
                          
Empirical Formula: C₆H₉NO
Molecular Weight: 111.1418
Index of Refraction: 1.531
Molar Refractivity: 31.36 cm³
Molar Volume: 101.3 cm³
Density: 1.09 g/cm³
Flash Point: 66.2 °C
Surface Tension: 36.4 dyne/cm
Enthalpy of Vaporization: 41.91 kJ/mol
Boiling Point: 182.9 °C at 760 mmHg
Vapour Pressure of 1-(4,5-Dihydro-3H-pyrrol-2-yl)ethanone (CAS NO.99583-29-6): 0.793 mmHg at 25 °C
Product Categories of 1-(4,5-Dihydro-3H-pyrrol-2-yl)ethanone (CAS NO.99583-29-6): ACETYLGROUP
Canonical SMILES: CC(=O)C1=NCCC1
InChI: InChI=1S/C6H9NO/c1-5(8)6-3-2-4-7-6/h2-4H2,1H3
InChIKey: DQBQWWSFRPLIAX-UHFFFAOYSA-N

 1-(4,5-Dihydro-3H-pyrrol-2-yl)ethanone , its cas register number 99583-29-6. It also can be called  2-Acetyl-1-pyrroline ; 1-(3,4-Dihydro-2H-pyrrol-5-yl)ethanon ; 1-(3,4-Dihydro-2H-pyrrol-5-yl)ethanone ; and Ethanone, 1-(3,4-dihydro-2H-pyrrol-5-yl)- .