| abstract |
Compounds of the formula (I) wherein n is 0, 1 or 2; n2 is 0, 1 or 2; X is a bond, O, S or NR1; and Ar1 is an aromatic ring consisting of 5 members, aromatic ring consisting of 6 members or a fused bicycloheterocycle. The compounds are useful in the treatment of conditions or disorders prevented or decreased by a7 nAChR ligands. The pharmaceutical compositions having compounds of the formula (I) and the methods for the use of such compounds and compositions are also disclosed. |