| Characters | A white or almost white, crystalline powder. |
| Identification | Positive reaction |
| Appearance of solution | The solutions are not more opalescent than reference suspension II. |
| PH | 3.5-5.5 |
| Specific optical rotation | +290°-+315° |
| Related substances | Any impurity ≤1 % |
| Dimethylaniline | Not more than 20ppm |
| Water | 11.5-14.5% |
| Sulphated ash | Not more than 1.0 per cent |
| Assay (anhydrous substance, C16H19N3O5S) | 95.0-100.5% |
| Storage | Store in an airtight container. |
