The present invention relates to the new compounds of general formula I wherein A, U, V, X, Y, R1, R2 and R3 are defined as stated hereinafter, the tautomers, the isomers thereof, the diastereomers, the enantiomers, the hydrates, the mixtures and the salts thereof as well as the hydrates of the salts, particularly the physiologically acceptable salts thereof with inorganic or organic acids or bases, medicaments containing these compounds, their use and processes for preparing them.