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Naproxen
| ITEMS | LIMIT |
| Description | White to off-white, practically odorless, crystalline powder |
| Identification | A: IR, Meet the requirements |
| B: UV, Meet the requirements | |
| Loss on drying | ≤0.5% |
| Specific rotation | +83°~ +89.5° |
| Heavy metals | ≤0.002% |
| Residual solvent – Methanol | ≤0.3% |
| Chromatographic purity | Single impurity: ≤0.5% |
| Total: impurities: ≤2.0% | |
| Assay | 98.5% ~ 101.5% |
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