HETEROCYCLIC COMPOUND

摘要

Disclosed is a heterocyclic compound which has an effect of enhancing AMPA receptor function. Specifically disclosed is a compound represented by formula (I0) or a salt thereof. (In the formula, Ra represents an optionally substituted C1-6 alkyl group; X0 represents a -CH2- group or the like; Y0 represents a -CRcRd- group or the like; Rb represents a hydrogen atom or the like; Rc and Rd may be the same or different and each represents a hydrogen atom; ring A0 represents a thiophene ring which may have a substituent, or the like; ring D0 represents an optionally substituted heterocyclic ring which contains, as a ring constituent atom, one heteroatom that is selected from among an oxygen atom and a nitrogen atom; and m represents 0 or 1.)