Patent ID: 8217031

Claim:
A compound represented by formula [1] or a pharmaceutically acceptable salt thereof, wherein: X is CH and Y is oxygen; R represents hydrogen, dialkylaminoacetyl, or alkyl optionally substituted with one to three substituents selected from the group consisting of cycloalkyl, alkenyl, halogen, cyano, amino, dialkylamino, alkoxycarbonyl, pyridyl, alkoxy, and hydroxy; Z represents hydrogen, alkyl, halogen, nitrile, or phenyl optionally substituted with one to three substituents selected from the group consisting of alkyl, alkoxy, and halogen; Ar represents phenyl, naphthyl, pyridyl, quinolyl, isoquinolyl, indolyl, carbazolyl, dibenzofuranyl, benzothienyl, or benzofuranyl, each of which is optionally substituted with one to three substituents selected from the group consisting of alkyl, hydroxyalkyl, alkoxy, halogen, haloalkyl, haloalkoxy, nitro, cyano, phenyl, aminocarbonyl, benzyloxy, benzyloxycarbonyl, hydroxycarbonyl, methoxycarbonyl, methanesulfonyl, amino, acetylamino, phthalimido, acetyl, monoalkylaminocarbonyl, and dialkylaminocarbonyl; wherein when Ar is an optionally substituted phenyl, the phenyl as such is optionally condensed with a cyclopentane ring, a cyclohexane ring, or a dioxolane ring; and n is 2 and m is 1.