Patent ID: 7189741

Claim:
A compound of formula (I): wherein: A 1 represents an alkylene, alkyleneoxy, alkylenethio, alkanoylene or hydroxyalkylene group; A 2 represents an alkylene, alkyleneoxy, alkylenethio, alkanoylene or an alkyleneoxyalkylene group; W 1 represents a phenylene, furanylene or pyridinylene group which is unsubstituted or substituted by one or more halogen atoms, alkoxy groups and/or alkyl groups; W 2 represents a 3–10 membered monocyclic or bicyclic group containing from 1 to 3 heteroatoms said group being unsubstituted or substituted by one or more halogen atoms, alkyl groups, alkoxy groups and/or oxo groups; R 1 represents a hydrogen or halogen atom or an alkyl, alkoxy or methylamino group; and R 2 represents a carboxyl group; and pharmaceutically acceptable salts thereof.