Molecular Structure of 3-Methyl-5-nitro-2-pyridone (CAS NO.21901-34-8):

IUPAC Name: 3-methyl-5-nitro-1H-pyridin-2-one 
Empirical Formula: C₆H₆N₂O₃
Molecular Weight: 154.1234
H bond acceptors: 5
H bond donors: 1
Freely Rotating Bonds: 1
Polar Surface Area: 66.13Ų
Index of Refraction: 1.567
Molar Refractivity: 36.94 cm³
Molar Volume: 113 cm³
Surface Tension: 50 dyne/cm
Density: 1.36 g/cm³
Flash Point: 151.7 °C
Enthalpy of Vaporization: 56.95 kJ/mol
Boiling Point: 327.2 °C at 760 mmHg
Vapour Pressure: 0.000205 mmHg at 25°C
EINECS: 244-647-9
Melting point: 230-234 °C
BRN: 126949
Product Categories: Pyridine; Pyridines, Pyrimidines, Purines and Pteredines; Pyridines
InChI
InChI=1/C6H6N2O3/c1-4-2-5(8(10)11)3-7-6(4)9/h2-3H,1H3,(H,7,9)
Smiles
c1([N+]([O-])=O)cc(C)c([nH]c1)=O

Hazard Codes: Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 37/39-26-36
S37/39:Wear suitable gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
RIDADR: 2811
PackingGroup: III

  3-Methyl-5-nitro-2-pyridone , with CAS number of 21901-34-8, can be called 2-Pyridinol,3-methyl-5-nitro- (6CI,7CI,8CI) ; 2-Hydroxy-3-methyl-5-nitropyridine ; 2-Hydroxy-5-nitro-3-picoline ; 3-Methyl-5-nitropyridin-2(1H)-one ; 6-Hydroxy-5-methyl-3-nitropyridine . It is a green-yellow solid.