Quality specificationUSP30/BP2007/CP2005/EP5.4 Chemical name: Acetylsalicylic acid So far, aspirin has been applied for centuries, the history of medicine has become one of the three classic drugs, since it is the world's most widely used antipyretic, analgesic and anti-inflammatory drugs, but also as a comparison and evaluation of other drugs standard preparation. In vivo the role of anti-thrombosis, it can inhibit platelet release reaction, inhibition of platelet aggregation, which generated reduced TXA2. Clinically for the prevention of cardiovascular and cerebrovascular disease attack.