| 摘要 |
Disclosed are compounds of the general formula (I) wherein R1 is methyl or ethyl and R2 is H, a straight-chain or branched C1-C6alkyl- or C2-C6alkenyl-radical, C3-C7cycloalkyl, benzyl or phenyl which is unsubstituted or mono-, di- or trisubstituted by methyl, methoxy, amino, F, Cl, Br or CF3, and their physiologically acceptable salts. Also disclosed is a method of their preparation and pharmaceutical agent containing these compounds. Said compounds are useful in treating or prevention of cardiac arrhythmia, infarct and angina pectoris.
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