| abstract |
(57) [Summary] [Structure] The following general formula: (Wherein R 1 represents a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group, and A represents a C 1 to C 5 alkylene group which may be substituted with a lower alkyl group). Tricyclic compounds and pharmaceutically acceptable salts thereof. [Effect] These compounds have excellent antihistamine action and antiallergic action, and are useful as therapeutic agents for allergic diseases and bronchial asthma. |