Benzoin resin or styrax resin is a balsamic resin obtaine from the bark of several species of trees in the genus Styrax. It is used in perfumes, some kinds of incense, and medicine (see tincture of benzoin). Its principle component is benzoic acid. Commonly called "benzoin", it is called "benzoin resin" here to distinguish it from the crystalline compound benzoin. Benzoin resin does not contain this crystalline compound.