Molecule structure of Methylpyrazolyl diethylphosphate (CAS NO.108-34-9) :

IUPAC Name: diethyl (5-methyl-1H-pyrazol-3-yl) phosphate 
Molecular Weight: 234.189461 g/mol
Molecular Formula: C₈H₁₅N₂O₄P 
Density: 1.248 g/cm³ 
Boiling Point: 331.4 °C at 760 mmHg 
Flash Point: 154.2 °C
Index of Refraction: 1.493
Molar Refractivity: 54.54 cm³
Molar Volume: 187.6 cm³
Polarizability: 21.62*10^-24 cm³
Surface Tension: 45 dyne/cm 
Enthalpy of Vaporization: 55.13 kJ/mol 
log P (octanol-water): 0.760 
Water Solubility: 1000 mg/L 
Vapor Pressure: 1.15E-05 mm Hg 
Henry's Law Constant: 1.23E-10 atm-m³/mole 
Atmospheric OH Rate Constant: 2.13E-10 cm³/molecule-sec
XLogP3-AA: 1.1
H-Bond Donor: 1
H-Bond Acceptor: 5
Rotatable Bond Count: 6
Tautomer Count: 2
Exact Mass: 234.076943
MonoIsotopic Mass: 234.076943
Topological Polar Surface Area: 73.4
Heavy Atom Count: 15
Complexity: 229
Canonical SMILES: CCOP(=O)(OCC)OC1=NNC(=C1)C
InChI: InChI=1S/C8H15N2O4P/c1-4-12-15(11,13-5-2)14-8-6-7(3)9-10-8/h6H,4-5H2,1-3H3,(H,9,10)
InChIKey: CDCTYRNLXFEDHC-UHFFFAOYSA-N

Poison by ingestion and subcutaneous routes. When heated to decomposition it emits very toxic fumes of NO_x and PO_x.
Hazard Codes: T+
Risk Statements: 26/27/28 
R26/27/28:Very toxic by inhalation, in contact with skin and if swallowed.
Safety Statements: 13-28-45 
S13:Keep away from food, drink and animal foodstuffs. 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)

 Methylpyrazolyl diethylphosphate (CAS NO.108-34-9) is also called 3-Methylpyrazolyl-5-diethylphosphate ; AI3-24723 ; Diethyl 3-methyl-5-pyrazolyl phosphate ; ENT 24,723 ; G-24483 ; Geigy G-24483 ; O,O-Diaethyl-O-(3-methyl-1H-pyrazol-5-yl)-phosphat [German] ; O,O-Diethyl O-(3-methyl-5-pyrazolyl) phosphate ; O,O-Diethyl-O-(3-methyl-1H-pyrazol-5-yl)-fosfaat [Dutch] ; O,O-Dietil-O-(3-metil-1H-pirazol-5-il)-fosfato [Italian] ; Phosphate de diethyle et de 3-methyl-5-pyrazolyle ; Phosphate de diethyle et de 3-methyl-5-pyrazolyle [French] ; Phosphoric acid, diethyl-(3-methyl-5-pyrazolyl) ester ; Phosphoric acid, diethyl-, 3-methylpyrazole-5-yl ester ; Pirazoxon ; Pyrazol-3(or 5)-ol, 5(or 3)-methyl-, diethyl phosphate ; Pyrazoxon ; Pyrazoxone . Methylpyrazolyl diethylphosphate (CAS NO.108-34-9) is high toxic. It is flammable by fire. It will produce toxic nitrogen oxide, phosphorus oxide gas by heat. So the storage environment should be ventilate, low-temperature and dry. Keep Methylpyrazolyl diethylphosphate (CAS NO.108-34-9) separate from raw materials of food.