The Molecular Structure of  1(2H)-Isoquinolone (CAS NO.491-30-5):

Empirical Formula: C₉H₇NO
Molecular Weight: 145.158
Appearance: Yellow Solid
IUPAC: 2H-isoquinolin-1-one
Nominal Mass: 145 Da
Average Mass: 145.158 Da
Monoisotopic Mass: 145.052764 Da 
Index of Refraction: 1.595
Molar Refractivity: 41.5 cm³
Molar Volume: 122 cm³
Surface Tension: 43.5 dyne/cm
Density: 1.188 g/cm³
Flash Point: 218.8 °C
Enthalpy of Vaporization: 62.39 kJ/mol
Boiling Point: 376.3 °C at 760 mmHg
Vapour Pressure: 7.34E-06 mmHg at 25°C 
Melting Point: 212.5 at 25°C 
log P (octanol-water): 1.420 (none) at 25°C 
Water Solubility: 476 mg/L at 20°C 
Vapor Pressure: 4.47E-05 mm Hg at 25°C
Henry's Law Constant: 1.73E-09 atm-m³/mole at 25°C
Atmospheric OH Rate Constant 4.10E-11 cm³/molecule-sec at 25°C
Product Categories: Quinolines, Quinazolines and derivatives;Heterocyclic Series;Quinoline&Isoquinoline;Aromatics Compounds;Quinolines;Aromatics;Bases & Related Reagents;Heterocycles;Nucleotides
InChI
InChI=1/C9H7NO/c11-9-8-4-2-1-3-7(8)5-6-10-9/h1-6H,(H,10,11)
Smiles
c12c(c([nH]cc1)=O)cccc2

Safety Statements: 22-24/25 
S22:Do not breathe dust
S24/25:Avoid contact with skin and eyes
WGK Germany: 3

 1(2H)-Isoquinolone (CAS NO.491-30-5) is also called as Isocarbostyril ; 1-Hydroxyisoquinoline ; 1-Isoquinolinol ; AI3-62131 ; EINECS 207-732-1 ; Isoquinolin-1-one ; NSC 27273 ; Isocarbostyril (VAN) (8CI) .