Patent ID: 8093251

Claim:
A compound represented by formula (I): wherein each of R 1 and R 2 independently means a hydrogen atom, or a C 1-10 alkyl group, wherein the C 1-10 alkyl group may optionally be substituted with one or more halogen atoms, R 3 means a C 2-9 nitrogen-containing heterocyclyl group, wherein the C 2-9 nitrogen-containing heterocyclyl group may optionally be substituted with one or more substituents independently represented by substituent set A, wherein substituent set A is a hydrogen atom, a hydroxyl group, a carboxyl group, a sulfo group, a carbamoyl group, a sulfamoyl group, a tetrazole group, a phosphono group, —CH 2 CO 2 H, —COCO 2 H, —SO 2 R 25 or —COR 25 , wherein R 25 means a C 1-10 alkoxy group, a C 2-9 heterocyclyl group or NR 26 R 27 , wherein each of R 26 and R 27 independently means a hydrogen atom or a C 1-10 alkyl group, wherein the C 1-10 alkyl group may optionally be substituted with one or more C 2-14 aryl groups, L 1 -X represents formula (II): wherein R a means a C 2-14 aryl group that may optionally be substituted with one or more substituents each of which is independently represented by —V 2 , wherein —V 2 means a halogen atom, a C 1-6 -alkyl group or a C 1-6 alkoxy group, wherein the C 1-6 alkyl group and the C 1-6 alkoxy group may be substituted with one or more halogen atoms, wherein R b means a hydrogen atom, a C 1-6 alkyl group or a C 1-6 alkoxy group, wherein the C 1-6 alkyl group and the C 1-6 alkoxy group may be substituted with one or more halogen atoms, L 2 means a single bond, L 3 means a single bond, X means OH, and Y means a sulfur atom, a tautomer thereof, or a pharmaceutically acceptable salt thereof.