The invention relates to compounds of formula (I)
wherein
A is a heteromonocyclic ring selected from furanyl, pirazinyl, pyrimidyl and pyridazinyl which may be unsubstituted or substituted by a substituent chosen from halogen, C₁-C₄ alkyl and CF₃;
R₁ is a) phenyl unsubstituted or substituted by halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy or CF₃; b) cyclohexyl; or c) a straight or branched C₁-C₆ alkyl group;
T is a branched or straight C₃-C₅ alkylene chain;
R₂ is hydrogen or C₁-C₄ alkyl, and the pharmaceutically acceptable salt thereof, which are useful as selective inhibitors of thromboxane A₂ (TxA₂) synthesis and TxA₂ antagonists.