Specification :

Colorless or white glossy tabular crystal or white crystalline powder, slight special odor. Little bitter taste. Melting point: 280-281 ( decompound) . Unstable to strong acid, can cause the demethylation. Soluble in water ( 5.6g/ 100ml 30 ) , warm diluted ethanol, alkali solution and diluted inorganic acid. Hard to dissolve in ethanol, almost does not dissolve in ether