Abstract: Pharmacologically active compounds corresponding to the general formula I ##STR1## in which R.sup.1 represents hydrogen, a lower alkyl or cycloalkyl-alkyl group or an optionally substituted phenyl-lower alkyl group,R.sup.2 denotes hydrogen or a lower alkyl group optionally substituted in the .alpha.-position to the nitrogen atom by lower alkoxy,R.sup.3 denotes hydrogen, lower alkyl, lower alkoxy, halogen or hydroxyl,n represents 1 or, if the --(CH.sub.2).sub.n -- chain is in the 4-position of the ring structure, also represents 2,R.sup.4 denotes hydrogen, lower alkyl, cycloalkyl, cycloalkyl-lower alkyl or an optionally substituted phenyl-lower alkyl group, andR.sup.5 denotes hydrogen, lower alkyl, cycloalkyl, cycloalkyl-lower alkyl or an optionally substituted phenyl-lower alkyl group, orR.sup.4 and R.sup.5, together with the nitrogen atom to which they are bonded, form a heterocycle andD represents a bond, or, if R.sup.4 and R.sup.5 do not denote hydrogen, also represents the --N.dbd.