appearance white fine crystalline powder
identification ir,uv conform
solubility very slightly soluble in water, in acetone, in chloroform, and in alcohol; soluble in methanol. melts at about 142℃,with decomposition
loss on drying 0.5% max
residue on ignition 0.2% max
iron 0.005% max
heavy metals 0.001% max
related substance total impurities 1.0% max
individual impurity 0.5% max
e-isomer 0.3% max
residual solvents 0.5% max
acetone 0.5% max
assay 99.0~101.0%
conclusion conform with usp32