... by trade name Aspirin, is an acetyl derivative of salicylic acid that is a white, crystalline, weakly acidic substance, ... inflammation, and swelling and thus has been used for treatment of rheumatoid arthritis, rheumatic fever, and mild infection. Large ... and relieve pain, is often substituted for Aspirin.Acetylsalicylic Acid is used in analgesics, anti-inflammatories, antipyretics, anticoagulants ...