Patent ID: 8293798

Claim:
A compound of formula (I) or pharmaceutically acceptable salts thereof, wherein R 1 is H, or halo or C 1-4 alkyl; R 2 is a 4 to 6 membered non-aromatic carbocylic group, or phenyl, or pyridinyl; which carbocylic or pyridinyl group is optionally substituted with one or two substituents, which may be the same or different, selected from the group consisting of: halo, C 1-4 alkyl, C 1-4 alkoxy, halo C 1-4 alkyl and halo C 1-4 alkoxy; or which phenyl group is substituted with one or two substituents, which may be the same or different, selected from the group consisting of: halo, C 1-4 alkyl, C 1-4 alkoxy, halo C 1-4 alkyl and halo C 1-4 alkoxy; R 3 is halo; R 4 is COOH, CH 2 COOH or tetrazolyl; X is C or N; and n is 0 or 1; with the proviso that when R 4 is in the 4 position on the ring, it cannot be CH 2 COOH; and when R 4 is in the 3 position on the ring, R 2 is not 4-chloro-phenyl.