Abstract: Tricyclic compounds represented by the following formula: ##STR1## wherein X represents --CH.dbd.CH--, --CH.sub.2 O--, or --O--;R.sup.1 represents a lower alkyl group,R.sup.2 represents a hydrogen atom or a lower alkyl group; andn represents an integer of from 1 to 5, pharmacologically acceptable salts thereof, and a method for preparing the same. The present compounds have anti-allergic and anti-histaminic activities and reduced side effects, and are useful as anti-allergic agents and anti-histaminic agents.

Abstract: Novel polycyclic compounds represented by the following formula: A--(CH.sub.2).sub.n --COOR.sup.1, wherein R.sup.1 represents a hydrogen atom or a lower alkyl group; n represents an integer of from 0 to 5; and A is a group represented by the following formula: ##STR1## wherein X represents a hydrogen atom or a halogen atom; and Y represents a methylene group, an oxygen atom, or a sulfur atom, or A is a group represented by the following formula: ##STR2## and pharmacologically acceptable salts thereof are disclosed. Also disclosed are a method for preparing the same, a pharmaceutical composition comprising the same, an antiallergic agent and an agent for bronchial asthma comprising the same, and a method for treatment of an allergic disease or bronchial asthma comprising the step of administering the same.