Gray white powder, taste slightly bitter, odorless. The relative density is 1.01~1.02, soluble in ethanol, acetone, chloroform, slightly soluble in benzene, insoluble in gasoline and water.

White or off-white powder, bitter, density of 1.12~1.20g/cm3, soluble in ethanol, acetone and benzene, slightly soluble in carbon tetrachloride, stable in air.

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