Patent ID: 7015216

Claim:
A compound of formula I: wherein Ar 1 is an aromatic or heteroaromatic group; each of R 1 , R 2 , R 3 , R 4 and R 5 are independently selected from the formula: -L 2 (Alk 3 ) t L 3 (R 7 ) u in which L 2 and L 3 which may be the same or different in each occurrence are selected from the group consisting of a covalent bond or a linker atom or group, t is zero or 1, u is 1, 2 or 3, Alk 3 is an aliphatic or heteroaliphatic chain, and R 7 is a hydrogen or halogen atom or a group selected from alkyl, —OR 8 , where R 8 is a hydrogen atom or an optionally substituted alkyl group, —SR 8 , —NR 8 R 9 , where R 9 is as defined for R 8 and may be the same or different, —NO 2 , —CN, —CO 2 R 8 , —SO 3 H, —SOR 8 , —SO 2 R 8 , —OCO 2 R 8 , —CONR 8 R 9 , —OCONR 8 R 9 , —CSNR 8 R 9 , —COR 8 , —OCOR 8 , —N(R 8 )COR 9 , —N(R 8 )CSR 9 , —SO 2 N(R 8 )(R 9 ), —N(R 8 )SO 2 R 9 , —N(R 8 )CON(R 9 )(R 10 ), where R 10 is a hydrogen atom or an optionally substituted alkyl group, —N(R 8 )CSN(R 9 )(R 10 ) or —N(R 8 )SO 2 N(R 9 )(R 10 ); Alk 1 is an optionally substituted aliphatic or heteroaliphatic chain; L 1 is a covalent bond or a linker atom or group; Alk 2 is a straight or branched alkylene chain; m is zero or 1; R 6 is a hydrogen atom or a methyl group; r is zero or 1; R is a carboxylic acid group; R a is a hydrogen atom or a methyl group; and Ar 2 is an optionally substituted aromatic or heteroaromatic group; or a pharmaceutically acceptable salt thereof.