| abstract |
An object of the present invention is to provide a novel AMPA receptor potentiator. A compound represented by the following formula (I) or a salt thereof: nwherein in formula (I) nR 1 represents n(1) a halogen atom, or (2) cyano group, or the like; n nRa and Rb each independently represent a hydrogen atom or C 1-4 alkyl; nL represents a bond, or a spacer in which the number of atoms in the main chain is 1 to 8; nRing A represents n(1) a non-aromatic carbon ring of 4-8 carbon atoms, or n(2) a 4- to 8-membered non-aromatic heterocycle neither of which is optionally substituted with 1 or more substituents selected from n(a) halogen atoms, and (b) cyano group; and n nAr represents na substituted phenyl group, or noptionally substituted 5- or 6-membered aromatic heterocyclic group. |