Patent ID: 8158620

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 a formula —NR e CO— (wherein R e is a hydrogen atom, 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 NR Y — (wherein R Y is a hydrogen atom, 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), or an oxygen atom, Z is a single bond, or a C 1 alkylene group which may have substituents selected from Substituent Group α, R 1 and R 2 are hydrogen atoms, and R 3 , R 4 , R 5 and R 6 are independently a hydrogen atom, or a C 1-6 alkyl group which may have 1 to 3 substituents selected from Substituent Group α, Substituent Group α is 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 a C 1-6 alkyl group), a C 2-6 alkenyl group which may have 1 to 3 substituents selected from Substituent Group β, a C 2-6 alkynyl group which may have 1 to 3 substituents selected from Substituent Group β, a carbamoyl group which may be substituted with one or two 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, a C 1-6 alkoxy group, a C 1-6 alkyl group, a C 3-8 cycloalkyl group and an oxo group.