| 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: wherein in formula (I) R1 represents (1) a halogen atom, or (2) cyano group, or the like; Ra and Rb each independently represent a hydrogen atom or C1-4 alkyl; L represents a bond, or a spacer in which the number of atoms in the main chain is 1 to 8; Ring A represents (1) a non-aromatic carbon ring of 4-8 carbon atoms, or (2) a 4- to 8-membered non-aromatic heterocycle either of which is optionally substituted with 1 or more substituents selected from (a) halogen atoms, and (b) cyano group; and Ar represents a substituted phenyl group, or optionally substituted 5- or 6-membered aromatic heterocyclic group. |