Patent ID: 8273745

Claim:
A compound represented by the formula (I): is a ring represented by the formula (i) X 1 is —N═; ---- is single bond or double bond; Y 1 and Y 2 are each C 1 -C 6 alkylene or C 2 -C 6 alknylene, wherein each methylene unit may be replaced with —O—, —NH—, —N(CH 3 )—, —NHC(═O)—, —N{C(═O)CH 3 }—, —S—, —S(═O)—, —S(═O) 2 —, phenylene, pyridinediyl, oxazolediyl, imidazolidiyl or C 3 -C 10 cycloalkylene; E 1 is phenyl which may be substituted with one or more substituents R 1 ; E 2 is phenyl or xanthenyl, each of which may be substituted with one or more substituents R 2 ; E 3 is a ring selected from the group consisting of (a),(b),(c),(d) and (e), each of which may be substituted with one or more substituents represented by R 3 ; wherein R 1 is halogen, —CH 3 or —OCH 3 ; R 2 is R 1 , phenyl, naphthyl, —O-phenyl, thienyl or quinolyl, each of which may be substituted with one or more substituents R 1 ; R 3 is halogen or —CH 3 ; R 4 is —H, C 1 -C 6 alkyl or alkali metal; R 5 is —H or halogen; and n is 1; or a pharmaceutically acceptable salt thereof.