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[CAS Name] 4-Hydroxypyrazolo[3,4-d]pyrimidine
[Formula] C5H4N4O
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Specification
Appearance
White or almost white powder
Formamide
220ppm max
Solubility
Soluble in solutions of potassium and sodium hydroxide;
very slightly soluble in water and in alcohol; practically
insoluble in chloroform and in ether.
Identification
Conform with IR spectrum
Clarity of solution
Clear 3FIU max (5%m/vin 2NaOH)
Related Substances (%)
Impurity A NMT 0.2
Impurity B NMT 0.2
Impurity C NMT 0.2
Impurity D NMT 0.2
Impurity E NMT 0.2
Impurity F NMT 0.2
Any individual unspecified impurity: not more than 0.1 %
Total impurities: not more than 1.0 %
Loss on drying (%)
NMT 0.5
Hydrazine
NMT 10PPM
Residual solvents
Ethanol NMT 1000ppm
Other solvent NMT 200ppm
Assay (%)
98.0%~102.0%
Standard
USP38
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