Paracetamol : Known as nature. White crystalline powder, no smell, flavor, slightly bitter flavor. Soluble in water or ethanol, acetone soluble slightly soluble in water. 168~171 ° C melting point. With antipyretic and analgesic effect for the flu with fever, joint pain, neuralgia, migraine, such as cancer pain and post-operative analgesia. Paired on the reduction of sodium p-nitrophenol from paracetamol, and acylation obtained.