Within the scope of this general structure, x preferably stands for the number 3, R1 and R2 each stand for a methyl group and R3 stands for either a methyl group or a saturated or unsaturated, linear or branched hydrocarbon chain with eight to 22 carbon atoms, in particular ten to eighteen carbon atoms.Physiologically acceptable anions include, for example, inorganic anions such as halides, in par