ic acid, sulfonic acids such a p-toluenesulfonic acid or ethanesulfonic acid, or the like. [0158] If the inventive compound is an acid, the desired salt may be prepared by any suitable method known to the art, including treatment of the free acid with an inorganic or organic base, such as an amine (primary, secondary or tertiary), an alkali metal or alkaline earth metal hydroxide or the like.