| abstract |
The present invention relates to carboxylic acids and esters of general formula n n n wherein Ar, R, R 1 , X 1 , X 3 , X 4 , Y and Y 1 are defined as in claim 1, the tautomers, the diastereomers, the enantiomers, the mixtures thereof and the salts thereof, particularly the physiologically acceptable salts thereof with inorganic or organic acids or bases, pharmaceutical compositions containing these compounds, the use thereof and processes for the preparation thereof, as well as the use thereof for the production and purification of antibodies and as labelled compounds in RIA and ELISA assays and as diagnostic or analytical aids in neurotransmitter research. |