3 7c cycloalkylmethyl or r4 and r5 together including the nitrogen atom to which they are attached are a 1 pyrrolidinyl 1 piperidinyl 1 hexahydroazepinyl 1 piperazinyl or 4 morpholinyl radical r6 and r7 are identical or different and are hydrogen or 1 2c alkyl and the salts of these compounds compounds of the formula i which are to be particularly emphasized are those in which z1 and z are identical or different and are 1 3 phenylene 1 4 phenylene 1 3 cyclohexylene or 1 4 cyclohexylene r4 and r5 independently of one another are hydrogen 1 4c alkyl or 3 7c cycloalkyl r6 and r7 are identical and are hydrogen and the salts of these compounds r6 and r7 are identical and are hydrogen and the salts of these compounds the synthesis of some exemplary compounds of the formula i is shown in reaction schemes 1 and 2 below further compounds of the formula 1 the preparation of which is not explicitly described in reaction schemes 1 and 2 can be prepared analogously or by using customary methods known per se to a person skilled in the art it is furthermore possible to convert compounds of the formula i by derivatization into other compounds of the formula i thus for example compounds of the formula i in which r6 and r7 are hydrogen can be converted by an alkylation reaction into compounds of the formula i in which r6 and r7 are 1 2c alkyl the person skilled in the art is familiar with suitable alkylation methods it is furthermore known to the person skilled in the art that if there are a number of reactive centers on a starting material or intermediate it may be necessary to block one or.