The present invention relates to new substituted carboxylic acid amides of general formula wherein A, B and R<;SUP>;1 <;/SUP>;to R<;SUP>;5 <;/SUP>;are defined as in claim 1 , the tautomers, the enantiomers, the diastereomers, the mixtures thereof and the salts thereof, particularly the physiologically acceptable salts thereof with inorganic or organic acids or bases, which have valuable properties.