Appearance A white or almost white crystalline powder Identification The infrared absorbance spectrum is concordant with the reference spectrum Acidity It should be yellow Melting point 136.0℃-142.0℃ Loss on dried 0.5% max Residue on ignition 0.1% max Heavy metal 20ppm max Phosphate 0.05% max Residual solvents Chloroform: 60ppm max Acetone: 5000ppm max Assay 98.5%-101.0%
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