| abstract |
Disclosed is a novel AMPA receptor function enhancer. Specifically disclosed is a compound represented by formula (Io) [wherein one of Y and Z represents a nitrogen atom or an oxygen atom and the other represents a carbon atom; R1a, R1b, R4a and R4b are independently not present or independently represent a hydrogen atom or a substituent; R2a, R2b, R3a and R3b independently represent a hydrogen atom or a substituent; R5 represents a substituent; and Ar represents a benzene ring or a monocyclic aromatic heterocyclic ring each of which may be substituted, wherein when the benzene ring or the monocyclic aromatic heterocyclic ring is substituted by two or more substituents, two of the substituents may together form a ring which may be substituted] or a salt thereof. |