Character names : aspirin, also known as acetylsalicylic acid. White crystalline powder. No foul, microstrip sourness. Density 1.35. 135-138 ° C melting point. Stable in dry air, in the event that the tide slowly into salicylic acid and acetic acid hydrolysis. Micro dissolve in water, soluble in alcohol, ether, chloroform, or soluble alkali carbonate hydroxide solution, while decomposition. Commonly used anti-inflammatory drugs. For antipyretic, analgesic, anti-rheumatic and promote the excretion of uric acid in patients with gout, anti-platelet aggregation and treatment of biliary ascariasis. By salicylic acid and acetic anhydride obtained by acylation.