Naproxen CAS NO.22204-53-1

We have GMP.

 Characteristics：A white or almost white, crystalline powder

[Identification：

A: Infrared Absorption

The infrared absorption spectrum is concordant with the reference spectrum

B: Ultraviolet Absorption

Absorptivities at 271nm,

calculated on the dried base,

do not differ by more than

[Specific rotation] ：+83.0°to +89.5°

[Loss on drying] ：≤0.5% 

[Heavy metals] ：≤0.002% 

[Chromatographic purity] 1

Impurity D(in-house) ：≤0.10% 

Impurity E(in-house, Impurity C in EP) ：≤0.10% 

Any other impurity： ≤0.10% 

Total impurities： ≤1.0% 

[Organic residual solvent] 2

Toluene：NMT 45ppm

Methanol：NMT 50ppm

[Assay] (On dry basis)It contains C14H14O3：98.5% ～ 101.5%

It conforms to USP35.