A process for the preparation of Dipyridamole.

A process the preparation of pure salts and polymorphs thereof.

Abstract An acid addition salt

The  present  invention  relates  to  novel  processes  for  the  preparation  of  N-[2-(diethylamino)ethyl]-5-[(Z)-(5-fluoro-1,2-dihydro-2-oxo-3H-indol-3-ylidene)methyl]-2,4-dimethyl-1H-pyro!e-3-carboxamide   and   salts   thereof,   in   particular   N-[2-(diethylamino)ethyl]-5-[(2)-(5-fluoro-1,2-dihydro-2-oxo-3H-...

Anhydrous, crystalline forms of thalidomide having high polymorphic purity.