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CAS NO.965-52-6 
Appearance:Yellow crystalline powder 
The detailed specifications are as below:
Test Items Specification
Appearance  Bright yellow crystalline powder
Solubility Practically insoluble in water, slightly soluble in alcohol and in methylene chloride.
Identification by IR The IR spectrum matches nifuroxazide standard spectrum.
Loss on drying ≤0.5%
Heavy metal(as Pb) ≤0.002%
Sulphated ash  ≤0.1%
Impurity A ≤0.05%
Related substance Impurity A max. 0.05%
- B,C,D each max. 0.3%, only one max. 0.1% allowed
- E max. 0.3%
- Unspecified impurities each max. 0.1%
- Sum of impurities others than E max. 0.5%
UV absorption The specific absorption at about 367nm is between940-1000
Assay (on dried) 98.5%-101.5%