Compounds of formula (I), wherein A-B, X, R1 and R2 have the meanings as cit ed in Claim No. 1, are ligands of the nicotinic acetylcholine receptor and are suited for the prophylaxis or treatment of schizophrenia, depression, anxiet y attacks, dementia, Alzheimer's disease, Lewy bodies dementia, neurodegenerative diseases, Parkinson's disease, Huntington's chorea, Tourette's syndrome, learning and memory disorders, old-age dysmnesia, for alleviating withdrawal symptoms related to nicotine dependency, and for treating cerebrovascular accident or damage to the brain caused by toxic compounds.
NICOTINIC ACETYLCHOLINE RECEPTOR LIGANDS