Structure of 5-Chloro-1-methyl-4-nitroimidazole (CAS NO.4897-25-0):

IUPAC Name: 5-chloro-1-methyl-4-nitroimidazole 
Empirical Formula: C₄H₄ClN₃O₂
Molecular Weight: 161.5465 
EINECS: 225-521-2 
Index of Refraction: 1.648
Molar Refractivity: 35.51 cm³
Molar Volume: 97.5 cm³
Polarizability: 14.07×10^-24cm³
Surface Tension: 62.7 dyne/cm
Density: 1.65 g/cm³
Flash Point: 172.9 °C
Enthalpy of Vaporization: 58.42 kJ/mol 
Melting Point: 148-150 °C(lit.)
Boiling Point: 362.3 °C at 760 mmHg
Vapour Pressure: 4.08E-05 mmHg at 25°C 
Physical Appearance: White Solid
Product Categories: Heterocyclic Compounds;Imidaxoles;Heterocycles;Halogenated Heterocycles;Heterocyclic Building Blocks;Imidazoles;ImidazolesBuilding Blocks

 5-Chloro-1-methyl-4-nitroimidazole (CAS NO.4897-25-0) can be used in organic synthesis,and is an important intermediate of anti-tumor azathioprine.

5-Chloro-1-methyl-4-nitroimidazole(4897-25-0) can be derived from the nitration of 1 - methyl -5 - chloro-imidazole.

Mutation data reported. When heated to decomposition it emits toxic vapors of NO_x and Cl⁻.
Hazard Codes:Xi
Risk Statements:
36:  Irritating to the eyes
37:  Irritating to the respiratory system
38:  Irritating to the skin
Safety Statements:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36:  Wear suitable protective clothing 
37:  Wear suitable gloves
39:  Wear eye/face protection
WGK Germany: 3
RTECS: NI4397100

  5-Chloro-1-methyl-4-nitroimidazole , its cas register number is 4897-25-0. It also can be called Imidazole, 5-chloro-1-methyl-4-nitro- ; 1H-Imidazole, 5-chloro-1-methyl-4-nitro- ; Imidazole, 5-chloro-1-methyl-4-nitro- .