Novel compounds of the formula: ##STR1## Where R.sup.1 is loweralkyl and R.sup.2 and R.sup.3 are independently H, loweralkyl, aryl, or--NR.sup.2 R.sup.3 forms a heterocyclic group such as imidazole, morpholine, piperidine, or piperazine were found to exhibit cardiac arrhythmia correcting properties.