abstract |
Piperazine derivatives of the formula Iin which R1 and R2 have the meanings given in claim 1 are dopamine ligands with a selectivity for the D4 receptor and are suitable for the treatment and prophylaxis of states of anxiety, depression, schizophrenia, obsessions, Parkinson's disease, tardive dyskinesia, nausea and disorders of the gastro-intestinal tract. |