CAS number： 616-91-1
Molecular formula： C5H8NO3S
molecular weight： 162.1875
Chemical structure：
| Product Name | N-acetyl-L-cysteine | |
| Shelf Life | 2 years | |
| Appearance | White crystals or crystalline powder | Conforms |
| Identification | Infrared Absorption | Conforms |
| Assay | 98.0 to 102.0% (Calculated on the dired basis) | 99.7% |
| Specific rotation ［α］D25 | +21.0° to +27.0° | +23.8° |
| pH | 2.0 to 2.8 | 2.2 |
| Loss on drying | Not more than 1.0% | 0.1% |
| Residue on ignition | Not more than 0.5% | 0.05% |
| Heavy metals (Pb) | Not more than 0.001% | ＜0.001% |
| Conclusion: Agree with the specification of USP38. | ||
