the application was whole incorporated herein by reference the process for preparing the pharmaceutically acceptable salts of the compounds having formula i comprises the steps of a dissolving or suspending the free acid of the present disclosure the compound having formula i in an organic solvent wherein the organic solvent is selected from the group consisting of methanol ethanol acetone ethyl acetate and tetrahydrofuran preferably tetrahydrofuran b adding a base to the mixture with stirring wherein the base may be organic or inorganic base such as alkali metal hydroxide or alkali earth metal hydroxide basic amino acid amine or quaternary ammonium c obtaining the pharmaceutically acceptable salt of the compound having formula i wherein the inorganic bases include alkaline metal hydroxides which are selected from the group consisting of the sodium hydroxide lithium hydroxide potassium hydroxide calcium hydroxide magnesium hydroxide the amines and the quaternary ammoniums are selected from the group consisting of tetramethyl quaternary ammonium tetraethyl quaternary ethanolamine choline lysine arginine methanamine dimethylamine trimethylamine ethylamine diethylamine triethylamine dibenzyl ethylenediamin meglumine piperazine and tromethamine preferably diethylamine ethanolamine piperazine choline hydroxide meglumine and tromethamine more preferably ethanolamine choline hydroxide meglumine and tromethamine the most preferably ethanolamine in step b the equivalence ratio of free acid and the base was preferably 1 5 u02dc 5 1 more preferably 1 1 u02dc 1 3 and the most preferably 1 1 u02dc 1 2 in step c the separation of salts preferably included direct filtration.