Metanilic acid (also known as m-aminobenzoic acid) is an organic compound with the chemical formula C6H5NH2. It is a white, crystalline solid that can be used in organic synthesis as an intermediate for the production of dyes, drugs, and other compounds. It is also used as a preservative for food, leather, and other materials. Its structure consists of a benzene ring with an amino group attached to one of the carbon atoms. The acid is slightly soluble in water, but is miscible in most organic solvents. Metanilic acid has a pKa of 4.38 and a melting point of 139 Degree C.