| abstract |
Quinolopyran-4-one-2-carboxylic acid derivatives and salts thereof are provided as novel compounds and as medicines for treatment of allergic asthma, each of the derivatives being represented by the general formula <IMAGE> wherein X designates a member selected from the group consisting of alkyl groups having 1 to 5 carbon atoms, alkoxy groups having 1 to 5 carbon atoms, halogen atoms, aryl-substituted alkoxy groups having 7 to 10 total carbon atoms, alkoxycarbonyl groups having 2 to 6 total carbon atoms, and aryl groups having 6 to 10 carbon atoms, and n is any one of the integers 1 through 4, X being the same group or different groups in the case where n is at least 2. |