Patent ID: 6835837
Filing Date: 2004-12-28
Classification: A61P,C07D

Abstract:
A method of forming a reaction product mixture substantially containing a benzenesulfonic acid salt of compound (I) characterized by X-ray Powder Diffraction peaks at 10.0, 19.5, 21.4, 22.4 and 30.5: said method comprisingadding an effective amount of benzenesulfonic acid to a mixture of compound (I) in an effective amount of a ester solvent to form a reaction mixture; adding an effective amount of a alcoholic solvent to said reaction mixture to form a reaction solution; causing crystallization effective to form crystals characterized by X-ray Powder Diffraction peaks at 10.0, 19.5, 21.4, 22.4, and 30.5.