| Appearance |
white or slightly yellowish powder, hygroscopic |
| Solubility |
practically insoluble in water, freely soluble in dimethylformamide, slightly soluble in acetone and in methanol |
| Identification |
a) Infrared absorption spectrophotometry |
| Liquid chromatography | impurities A, B: for each impurity, not more than 0.1% |
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| any other impurity: for each impurity, not more than 0.1% |
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| total: not more than 0.2% |
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| disregard limit: 0.05% |
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| Heavy metals | Maximum 10 ppm |
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| Water | Maximum 1.0% |
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| Sulphated ash | Maximum 0.1% |
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| ASSAY | 98.0% to 101.0% |
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| 1)calculated with reference to the anhydrous substance |
