| Colour | White |
| Shape | Crystalline particles or powder |
| Assay, w/% | 98.0~ 102.0 |
| Specific rotation [α]d20ºC, ° | +14.5~+16.5 |
| Transmittance | ≥0.95 |
| pH value | 4.5~6.0 |
| Loss on drying, w/ % | ≤4.5 |
| Residue on ignition, w/ % | ≤0.2 |
| Lead (Pb), mg/kg | ≤1.0 |
| 5-Benzyl-3, 6-dioxo-2-piperazineacetic acid, w/ % | ≤1.5 |
| Other related substances, w/ % | ≤2.0 |