Molecular Structure:
| Product name | N-Acetyl-L-Thioproline |
| Item | Specification |
| Appearance | White crystals or crystalline powder |
| Specific Rotation[α]D20 | -128° to -138° |
| State of solution | Clear and colorless |
| Not less than 98.0% | |
| Iron (Fe) | Not more than 10ppm |
| Heavy Metals (Pb) | Not more than 10ppm |
| Aresenic (As2O3) | Not more than 1ppm |
| Other amino aicds | No spot |
| Loss on drying | Not more than 0.5% |
| Residue on ignition | Not more than 0.2% |
| Assay | 98.5% to 101.0% |