butamben and its Impurities

Butamben is a local anesthetic in the form of n-butyl-p-aminobenzoate. It is the ester of 4-aminobenzoic acid and butanol. A white, odourless, crystalline powder. that is mildy soluble in water and soluble in alcohol, ether, chloroform, fixed oils, and dilute acids. Reference standards of Butamben API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below