Metabio Joullie

Paul M Fabiani

Christian J Warolin

Bernard Gaudilliere

Pierre Muller

Francis E Rose

There are provided compounds of the general formula ##STR1## in which Ar represents a phenyl group which is unsubstituted or substituted by a halogen atom or a lower alkyl group, or represents a thienyl group, R.sub.1 represents a hydrogen or halogen atom or, when the Ar--CO-- grouping is in the meta-position with respect to the nitrogen atom, a lower alkyl group, R.sub.2 represents a hydrogen atom, or a lower alkyl or an acyl group, and R.sub.3 represents a hydrogen atom, a lower alkyl or a phenyl group and a physiologically acceptable salt thereof. The compounds of the general formula I and their salts have therapeutic utility, especially as analgesics.

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Neuilly-sur-Seine, France

Paul M Fabiani