| abstract |
The present invention relates to the use of a compound of formula I n n n n n n n n n n wherein R 1 , R 2 , R 3 , R 4 , X and n are as defined hereinn nor to a pharmaceutically acceptable acid addition salt, to a racemic mixture, or to its corresponding enantiomers and/or optical isomers for the treatment of psychoses, pain, dysfunction in memory and learning, attention deficit, schizophrenia, dementia disorders or Alzheimer's disease. |