An improved process is described to resolve a racemic mixture in any
proportion of 5-(2-(2-(2-ethoxyphenoxy)ethylamino)propyl)-2-methoxy
benzene sulfonamide as a free base or some of its salts, with BPA either
S or R form to obtain enantiomerically highly pure R and S-isomer as a
well characterized free base or as a salt of the title compound. Also
described are novel R and S-isomers of 5-(2-(2-(2-ethoxyphenoxy)
ethylamino)propyl)-2-methoxy benzene sulfonamide and their salts and the
processes for their preparation.