| abstract |
Compounds of the formula I n n n in which A-B, X, R 1 and R 2 are as defined in claim 1, are ligands of the nicotinic acetylcholine receptor and are suitable for the prophylaxis or treatment of schizophrenia, depression, anxiety states, dementia, Alzheimer's disease, Lewy bodies dementia, neurodegenerative disorders, Parkinson's disease, Huntington's disease, Tourette's syndrome, learning and memory restrictions, age-induced memory impairment, amelioration of withdrawal symptoms in nicotine dependence, strokes or brain damage by toxic compounds. |