摘要:
Novel amphoteric tricyclic compound represented by the following formula:
wherein R¹ represents a hydrogen atom or a halogen atom; X represents -O-, -CH₂O-, or -OCH₂-; and Y represents a C₂-C₅ alkylene group which may optionally be substituted with a lower alkyl group, and a pharmacologically acceptable salt thereof are disclosed. Also disclosed are a method for preparing the same, a pharmaceutical composition comprising the same useful as an antiallergic agent and an agent for bronchial asthma, and a method for treatment of an allergic disease or bronchial asthma comprising the step of administering the same.