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Pyrimethamine
| ITEMS | LIMIT |
| Appearance | Colourless crystal fine powder |
| Clarity and colour of solution | ≤BY6 |
| Sulphate | ≤80ppm |
| Related Substances | ≤0.25% |
| Any second spot | ≤0.25% |
| Loss on drying | ≤0.5% |
| Ash | ≤0.1% |
| Identification Identification A | IR |
| Identification B | Test for Chloride |
| Melting range(℃) | 238.0~242.0 |
| Ordinary impurities | Complies stipulate |
| OVI | ≤0.2% |
| Residual Solvents | Complies stipulate |
| Assay | 99.0%~101.0% |
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