The invention relates to aqueous infusion or injection solutions that have a long shelf life and contain an active substance of general formula (I), wherein the radicals L, R1, R2, R3, R4, and R5 have the meanings indicated in the claims and the description, an amount of a physiologically acceptable acid or acid mixture which is sufficient to dissolve the active substance and stabilize the solutions, and additional optional auxiliary formulation agents suitable for parenteral use. Also disclosed is a method for producing the inventive infusion or injection solutions.