Acetanilide is an organic compound with the formula C8H9NO. It appears as a white, odorless solid and is known for its use as an intermediate in the synthesis of pharmaceuticals and dyes. Acetanilide was historically used as a pain reliever and fever reducer, though it has been largely replaced by safer alternatives due to its potential for toxic side effects. It is also used in organic chemistry as a stabilizer for hydrogen peroxide and in the preparation of rubber accelerators.