| 摘要 |
A compound of formula (I), wherein: A1 represents an alkylene, alkyleneoxy, alkylenethio, alkanoyl or hydroxyalkylene group, A2 represents a single bond, an alkylene or alkenylene group, W represents a single bond or an optionally substituted phenylene or furanylene group, R1 represents a hydrogen, alkyl, alkenyl, alkynyl, alkoxyalkyl, alkenyloxyalkyl, alkynyloxyalkyl, alkoxy-alkoxyalkyl, or an optionally substituted phenylalkyl group, R2 represents a hydrogen, halogen, alkyl or alkoxy group, and R3 represents a carboxyl or tetrazolyl group. The compounds are used in the preparation of medicaments for use as antihistaminic or antiallergic agents.
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