Molecular structure of 1,5-Dimethylpyrazole-3-carbonyl chloride (CAS NO.49783-84-8) is:

Product Name: 1,5-Dimethylpyrazole-3-carbonyl chloride
CAS Registry Number: 49783-84-8
Molecular Formula: C₆H₇ClN₂O
Molecular Weight: 158.59
Melting Point: 73 °C
Index of Refraction: 1.571 
Molar Refractivity: 39.73 cm³ 
Molar Volume: 120.7 cm³
Surface Tension: 40.4 dyne/cm 
Density: 1.31 g/cm³ 
Flash Point: 105.1 °C 
Enthalpy of Vaporization: 48.74 kJ/mol 
Boiling Point: 250.2 °C at 760 mmHg 
Vapour Pressure: 0.022 mmHg at 25 °C 
Product Categories: ACIDHALIDE
SMILES: O=C(Cl)c1nn(c(c1)C)C
InChI: InChI=1/C6H7ClN2O/c1-4-3-5(6(7)10)8-9(4)2/h3H,1-2H3
InChIKey: BADBQYAILRGCBB-UHFFFAOYAO 
Std. InChI: InChI=1S/C6H7ClN2O/c1-4-3-5(6(7)10)8-9(4)2/h3H,1-2H3
Std. InChIKey: BADBQYAILRGCBB-UHFFFAOYSA-N

Safty information about 1,5-Dimethylpyrazole-3-carbonyl chloride (CAS NO.49783-84-8) is:
Hazard Codes: C; Xi
Risk Statements: 34 
R34:Causes burns.
Safety Statements: 26-36/37/39-45 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: 3261
Hazard Note: Irritant/Corrosive

 1,5-Dimethylpyrazole-3-carbonyl chloride , its cas register number is 49783-84-8. It also can be called 1,5-Dimethyl-1H-pyrazole-3-carbonyl chloride ; 1H-Pyrazole-3-carbonylchloride, 1,5-dimethyl- .