Patent ID: 7432287

Claim:
A compound represented by formula (I): or a pharmaceutically acceptable salt or solvate thereof, wherein: X 1 represents oxygen, sulfur or NH; X 2 represents oxygen, sulfur or CH 2 ; R 1 represents 1 or 2 substituents optionally present on Ring A which are selected from the group consisting of: alkylsulfonyl, alkanoyl, lower alkyl, hydroxyalkyl, hydroxy, alkylcarbamoyl, alkylsulfamoyl, dialkylsulfamoyl, alkylthio, alkoxy, dialkylcarbamoyl, alkoxycarbonylamino, alkoxycarbonyl, halogen atoms, alkanoylaminoalkyl, alkoxycarbonylaminoalkyl, alkylsulfonylaminoalkyl, cyano and trifluoromethyl; R 2 represents: a C3-7 cyclic alkyl group wherein one of the constituent carbon atoms of the ring, except for the carbon atom, which is bonded to X 2 , is optionally replaced with oxygen, NH, N-alkanoyl or CONH; a straight-chain or branched lower alkyl group or a lower alkenyl group, optionally having a substituent selected from the group consisting of halogen atoms, carboxyl, alkoxycarbonyl, hydroxy, amino optionally substituted with 1 or 2 alkanoyl or lower alkyl groups, alkoxy and N-alkylcarbamoyl; R 3 represents 1 or 2 substituents optionally present on Ring B which are selected from the group consisting of: lower alkyl; alkoxy; alkylamino; lower dialkylamino; halo; trifluoromethyl; hydroxyalkyl, wherein the hydrogen of the hydroxy in the hydroxyalkyl group may be substituted with lower alkyl; aminoalkyl; alkanoyl; carboxyl; alkoxycarbonyl and cyano; the following formula (II): represents a pyridyl ring; and formula (III): represents a pyridyl ring.