IUPAC Name: 5-Bromo-2,3-dihydroinden-1-one 
Following is the structure of 5-Bromo-1-indanone (CAS NO.34598-49-7):
                               
Empirical Formula: C₉H₇BrO
Molecular Weight: 211.0553 
Index of Refraction: 1.622
Molar Refractivity: 46.24 cm³
Molar Volume: 131.2 cm³
Density: 1.608 g/cm³
Flash Point: 120.2 °C
Surface Tension: 49.9 dyne/cm
Melting point: 126-129 °C(lit.)
Enthalpy of Vaporization: 54.4 kJ/mol
Boiling Point: 303.7 °C at 760 mmHg
Vapour Pressure: 0.000915 mmHg at 25 °C
Product Categories: Carbonyl Compounds; Indane/Indanone and Derivatives; Heterocycles series; Indanone & Indene; Ketone; Fused Ring Systems; Halides; C9; Carbonyl Compounds; Ketones
Appearance: Properties white to light yellow crystal powder
Canonical SMILES: C1CC(=O)C2=C1C=C(C=C2)Br
InChI: InChI=1S/C9H7BrO/c10-7-2-3-8-6(5-7)1-4-9(8)11/h2-3,5H,1,4H2
InChIKey: KSONICAHAPRCMV-UHFFFAOYSA-N

 5-Bromo-1-indanone (CAS NO.34598-49-7) hasn't been listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65. And the toxicological properties have not been fully investigated.

Hazard Codes: Xn,Xi
Risk Statements: 20/21/22-36/37/38-22 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R22:Harmful if swallowed.
Safety Statements: 26-36-36/37/39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
WGK Germany: 3
Hazard Note: Harmful
HazardClass: IRRITANT

 5-Bromo-1-indanone , its cas register number is 34598-49-7. It also can be called 5-Bromoindanone ; 5-Brom-2,3-dihydro-1H-inden-1-on .
 5-Bromo-1-indanone (CAS NO.34598-49-7) could be stable under normal temperatures and pressures. It should avoid the condition like incompatible materials. It is not compatible with strong oxidizing agents. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, carbon dioxide, hydrogen bromide, bromine fumes. However, its hazardous polymerization will not occur.