| abstract |
A compound of formula (III): or a salt, solvate and chemically protected form thereof, wherein: R5 is an optionally substituted C5-20 aryl or C4-20 alkyl group; L' is a single bond, -O- or -C(=O)-; A is selected from the group consisting of: formulae (i) (ii) (iii) wherein X and Y are selected from the group consisiting of: O and CR3; S and CR3; NH and CR3; NH and N; O and N; S and N; N and S; and N and O, and where the dotted lines indicate a double bond in the appropriate location, and where Q is either N or CH; D is selected from: formulae (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) B is selected from the group consisting of: formulae (A) (B) where RP6 is selected from fluoro and chloro; and R2 is either: (i) -CO2H; (ii) -CONH2; (iii) -CH2-OH; or (iv) tetrazol-5-yl. |