Patent ID: 8198269

Claim:
A compound represented by the formula (I): or a pharmaceutically acceptable salt thereof, wherein Ring A is a C 6-14 aryl group which may have 1 to 3 substituents selected from Substituent Group α or a 5- to 6-membered heteroaryl group which may have 1 to 3 substituents selected from Substituent Group α, L is a single bond or —NR L CO— (wherein R L is a hydrogen atom or a C 1-6 alkyl group which may have 1 to 3 substituents selected from Substituent Group α), Ring B is a C 6-14 aryl group which may have 1 to 3 substituents selected from Substituent Group α or a 5- to 10-membered heterocyclic group which may have 1 to 3 substituents selected from Substituent Group α, X is a methylene group which may have 1 to 2 substituents selected from Substituent Group α, Y is a methylene group which may have 1 to 2 substituents selected from Substituent Group α, Z is an oxygen atom, R 1 and R 2 are hydrogen atoms, and R 3 , R 4 , R 5 and R 6 are independently a hydrogen atom, a halogen atom, a hydroxy group, a C 1-6 alkyl group which may have 1 to 3 substituents selected from Substituent Group α, or R 4 and R 6 together may form a ring represented by the formula (II): wherein Y, Z, R 5 and R 3 are the same as defined above and Q is an oxygen atom, a methylene group or an ethylene group Substituent Group α is a hydrogen atom, a halogen atom, a hydroxy group, a nitro group, a C 1-6 alkylthio group, a C 6-14 aryl group, a C 6-14 aryloxycarbonyl group, a C 6-14 arylcarbonyl group, a cyano group, a C 3-8 cycloalkoxy group, a C 3-8 cycloalkyl group, a C 3-8 cycloalkylthio group, a sulfonylamino group (wherein the sulfonylamino group may be substituted with 1 to 2 C 1-6 alkyl groups), a C 2-6 alkenyl group which may have 1 to 2 substituents selected from Substituent Group β, a C 2-6 alkynyl group which may have 1 to 2 substituents selected from Substituent Group β, a carbamoyl group which may be substituted with 1 to 2 C 1-6 alkyl groups, a C 1-6 alkoxy group which may have 1 to 3 substituents selected from Substituent Group β, a C 1-6 alkyl group which may have 1 to 3 substituents selected from Substituent Group β and a 5- to 10-membered heterocyclic group which may have 1 to 3 substituents selected from Substituent Group β, Substituent Group β is a halogen atom, a cyano group, a hydroxy group and a C 1-6 alkoxy group (wherein the alkoxy group may be substituted with a phenyl group which may be substituted with 1 to 3 substituents selected from a hydrogen atom, a halogen atom, a hydroxy group and a nitro group).