acid derivatives thienyl or pyrrolyl carboxylic acids, their preparation and medicaments containing them.

Compounds of formula (CF DRAWING IN BOPI) wherein R1 represents OH, (C1 -C6) alkyl, (C1 -C1 2) alkoxy, phenyl or NZ1 Z2 ; R2 represents OH, SH, (C1-C4) alkoxy, (C1-C4) alkylthio or NZ1 Z2; R3 is H, (C1-C4) alkyl, (C1-C4) alkylthio, (C1-C4) alkoxy, phenyl or benzyl; A is S, and in this case R represents nothing, or A represents N and R represents H or (C1-C4) alkyl which may be substituted by phenyl or NZ1 Z2; B represents phenyl, pyridyl or thienyl which is condensed with the pyridyl nucleus, and B is optionally substituted by one or more groups selected from halo, (C1 -C6) alkyl, (C1-C4) alkoxy, CF3, CH2 NZ1 Z2 or Z2 NZ1; and Z1 and Z2 represent, independently of each other H, (C1-C4) alkyl, benzyl, or they form with the nitrogen atom to which they are attached a saturated heterocycle, optionally substituted; and salts thereof.