A compound of formula (I): or a salt, or chemically protected form thereof, wherein: R5 is an optionally substituted phenyl; A is  wherein Q is N; R3 is selected from H, F, Cl and optionally substituted C1-4 alkyl, C1-4 alkoxy, C5-7 aryl, and C5-7 aryl-C1-4 alkyl groups; R4 is selected from H, F, Cl and optionally substituted C1-4 alkyl, C1-4 alkoxy, C5-7 aryl, and C5-7 aryl-C1-4 alkyl groups; R6 is selected from H, F, Cl, and optionally substituted C1-4 alkyl, C1-4 alkoxy, C5-7 aryl, and C5-7 aryl-C1-4 alkyl groups; D is selected from: B is selected from the group consisting of: Where RN′ is selected from H and C1-4 alkyl; where one of RP3 and RP4 is —Cm-alkylene-R2 and the other of RP3 and RP4 is H, m and n can be 0 or 1, and m+n=1 or 2; and additionally, when RP3 is —Cm-alkylene-R2, m can also be 2 or 3, and m+n=1, 2, 3 or 4, and when R2 is tetrazol-5-yl, m+n may be 0; or where one of RP3 and RP4 is —O—CH2—R2, and the other of RP3 and RP4 is H, n is 0; RN is H or optionally substituted C1-4 alkyl; R2 is either: (i) —CO2H; (ii) —CONH2; (iii) —CH2—OH; or (iv) tetrazol-5-yl.