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| PH | 5.0-7.2 |
| Appearance | White to yellowish powder |
| Identification | Complies with the test |
| Residue on ignition | ≤4.5% |
| Loss on drying | ≤2.0% |
| Heavy Metals | ≤0.002% |
| Tyramine | The aborbency should not be greater than that of reference solution |
| Tylenol A | ≥80% |
| Sum of Tylenol A、B、C and D | ≥95% |
| Potency(dried basis) | ≥800μ/mg |