Patent ID: 6933317

Claim:
A compound represented by the formula (I): wherein R 1 is optionally substituted heteroaryl; R 2 is hydrogen or alkyl; R 3 is —CH 2 —CH 2 —CH 2 —CH 2 —CH═CH—COOR 4 , —CH 2 —CH 2 —CH 2 —CH 2 —X 1 —CH 2 —COOR 4 , —CH 2 —CH═CH—CH 2 —X 1 —CH 2 —COOR 4 or —CH 2 —CH 2 —CH 2 —CH 2 —COOR 4 ; R 4 is hydrogen or alkyl; X 1 is —O— or —S—, a prodrug, a pharmaceutically acceptable salt or a solvate thereof.