Dithioacetal compounds, processes for preparation thereof and pharmaceutical composition comprising the same.

摘要

A dithioacetal compound of the formula : <CHEM> wherein R<1> is lower alkyl, di-(lower)alkylamino, aryl, or heterocyclic group which may have one or more substituents selected from halogen, lower alkyl, lower alkoxy and phenyl, R<2> and R<3> are each lower alkyl, aryl or ar-(lower)alkyl, or R<2> and R<3> are together to form 1,3-dithian ring, R<4> is hydrogen or lower alkoxy, and n is O or an integer 1 to 4 and pharmaceutically acceptable salts thereof, processes for their preparation and pharmaceutical compositions comprising them as an active ingredient.