Patent ID: 7528157

Claim:
A compound of formula (I): or a salt, solvate and chemically protected form thereof, wherein: R 2 is H or an optionally substituted C 1-4 alkyl group; Y is either —(CH 2 ) n —X—, where n is 1 or 2 and X is NR N1 , where R N1 is selected from H or optionally substituted C 1-4 alkyl, or Y is —C(═O)NR N2 —, where R N2 is selected from H, and optionally substituted C 1-7 alkyl or is a C 5-20 aryl group, which C 5-20 aryl group has from 5 to 20 ring atoms, which ring atoms may be all carbon atoms or may include one or more heteroatoms; R 3 is an optionally substituted C 6 aryl group linked to a further optionally substituted C 6 aryl group, wherein each optionally substituted C 6 aryl group has six ring atoms, which ring atoms may be all carbon atoms or may include one or more heteroatoms; and wherein if both C 6 aryl groups are benzene rings, there may be an oxygen bridge between the two rings, bound adjacent the link on both rings; A is a single bond or a C 1-3 alkylene group; and R 5 is either: (i) carboxy; (ii) a group of formula (II): (iii) a group of formula (III): wherein R is optionally substituted C 1-7 alkyl or NR N3 R N4 , where R N3 and R N4 are independently selected from optionally substituted C 1-4 alkyl, or is an optionally substituted C 5-20 aryl group which C 5-20 aryl group has from 5 to 20 ring atoms, which ring atoms may be all carbon atoms or may include one or more heteroatoms, (iv) tetrazol-5-yl.