Patent ID: 7534903

Claim:
A method of treating cardiac arrhythmia in a patient suffering therefrom, said method comprising administering to said patient a pharmaceutically effective amount of a compound corresponding to formula I: wherein R 1 is C 1-4 -alkyl, R 2 is C 1-4 -alkyl, R 3 is phenyl which is optionally substituted 1 or 2 times by halogen, C 1-4 -alkyl, C 1-4 -alkoxy or trifluoromethyl; naphthyl or biphenyl, R 4 is hydrogen; C 1-6 -alkyl or C 3-7 -cycloalkyl-C 1-4 -alkyl, R 5 is hydrogen, and R 6 is C 1-6 -alkyl; phenyl-C 1-4 -alkyl, the phenyl group of which is optionally substituted once by halogen; furyl-C 1-4 -alkyl or tetrahydronaphthyl, or R 5 and R 6 , together with the nitrogen to which they are bonded, form a piperazine ring which may optionally be substituted by phenyl.