| Items | Standard |
| Character | White or almost white crystalline powder |
| Identification | Positive |
| Residue on ignition | ≤0.5% |
| Heavy metals | NMT 20ppm |
| Arsenic | NMT 5ppm |
| Sulphated ash | NMT 0.1% |
| Loss on drying | NMT 0.5% |
| Total impurities | NMT 1.5% |
| Assay(HPLC) | 97%-103% |

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