Patent ID: 8501749

Claim:
A compound of the formula (I): wherein X 1 , X 2 , X 3 and X 4 are each independently —CH— or nitrogen, with the proviso that at least one of them is nitrogen; E is —COOH or —COOR wherein R is C 1 -C 5 alkyl; G is C 1 -C 2 alkyl; J is a heteroaryl group optionally substituted with 1-3 substituents chosen from halogen, C 1 -C 3 alkyl and C 1 -C 3 alkoxy; M is C 1 -C 5 alkyl optionally substituted with 1-3 substitutents chosen from C 1 -C 5 alkyl and C 3 -C 6 carbocycle; or a pharmaceutically acceptable salt thereof.