A compound of formula (III): or a salt, solvate and chemically protected form thereof, wherein: R
5
is an optionally substituted C
5-20
aryl or C
4-20
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 consisting of: O and CR
3
; S and CR
3
; NH and CR
3
; 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) (vii) (viii) (ix) B is selected from the group consisting of: formulae (A) (B) where R
P6
is selected from fluoro and chloro; and R
2
is either: (i) —CO
2
H; (ii) —CONH
2
; (iii) —CH
2
—OH; or (iv) tetrazol-5-yl.
式(III)的化合物:或其盐,溶剂合物和
化学保护形式,其中:R5是可选择取代的C5-20芳基或C4-20烷基;L'是单键,-O-或-C(═O)-;A选择自以下组:式(i)(ii)(iii),其中X和Y选择自以下组:O和CR3;S和CR3;NH和CR3;NH和N;O和N;S和N;N和S;和N和O,其中点线表示适当位置的双键,Q为N或CH;D选择自:式(i)(ii)(iii)(iv)(v)(vii)(viii)(ix);B选择自以下组:式(A)(B),其中RP6选择自
氟或
氯;R2为:(i)-CO2H;(ii)-CONH2;(iii)-
CH2-OH;或(iv)
四唑-5-基。