The hemihydrate is acicular crystal (water). 110℃into anhydrous compound. The melting point is 208℃, [α] 20D-35.2.The solubility in water (C2.8) .25℃is 4 and the solubility in hot water is higher. It is easy to dissolve in ethanol and acetone, and very slightly soluble in ethyl acetate. Lv Yuan has a wide range of antibacterial effects, but can be inactivated by protein in vivo. Similar to caffeic acid, oral or intraperitoneal injection increased central excitability in rats. It can increase the peristalsis of small intestine in rats and mice and the tension of uterus in rats. It is beneficial to gallbladder and can increase bile secretion in rats. It can cause asthma after inhaling the plant dust containing this product. Dermatitis etc. Chlorogenic acid EINECS 206-325-6CAS No 327-97-9 molecular formula C16H18O9 molecular weight 354.31 density 1.65g/cm3 melting point 205-209℃boiling point 665℃flash point 245.5℃refraction index -37°