Appearance White or off white crystalline powder
Solubility Freely soluble in pyridine and acetic acid(100), sparingly soluble in methanol, slightly soluble in ethanol, very slightly soluble in water, and practically insoluble in diethyl ether
Melting point 159~163℃
Identification (a) positive reaction must comply
(b) positive reaction must comply
(c) UV There is the strongest absorption at the wavelength of 234~238nm and 275~278nm
(d) IR There is absorption at 1741,1703,1585,1241 and 706 cm-1
Relative substances E-isomer 0.5% max
Total impurities 1.0% max
Heavy metals 10ppm max
Loss on drying 1.0% max
Toluene 0.089% max
Ethanol 0.5% max
Acetone 0.5% max
Tetrahydrofuran 0.072% max
Chlorobenzene 0.036% max