abstract |
Compounds having the formula I <CHEM> wherein R<1> is alkylsulphonamido, arylsulphonamide or perfluoroalkylsulphonamido, R<2> and R<3> are hydrogen or alkyl, R<4> is alkyl and n is 2 to 4 and the pharmaceutically acceptable salts thereof are useful as Class III arrhythmic agents. |