-1-sulfonates, naphthalene-2-sulfonates, and mandelates.If the inventive compound is a base, the desired salt may be prepared by any suitable method known to the art, including treatment of the free base with an inorganic acid, such as hydrochloric acid; hydrobromic acid; sulfuric acid; nitric acid;phosphoric acid; and the like, or with an organic acid, such as acetic acid; maleic acid; succinic a