CAS number： 79349-82-9
Molecular formula： C9H10N2O3S
molecular weight： 226.25
Chemical structure：
| Item | Specification |
| Specific rotation | +39.5 to +41.5° |
| State of solution(transmittance) | Clear 98.0% min. |
| Chloride[cl] | 0.020% max. |
| Ammonium [NH4] | 0.02% max. |
| Sulfate[SO4] | 0.020% max |
| Iron[Fe] | 10ppm max. |
| Heavy metals [Pb] | 10ppm max |
| Arsenic[As2O3] | 1ppm max |
| Other amino acids | Chromatographically not detectable |
| Loss on drying | 0.20% max. |
| Residue on ignition[sulfated] | 0.10% max. |
| Assay | 99.0% min |
