Abstract: Novel ester derivatives of quinolopyran-4-one-2-carboxylic acids and the tautomers thereof are provided, the ester groups being specified and restricted. These novel compounds are especially useful as antiallergic antasthmatics or remedies for asthma, and can be administered orally with long duration of action.

Abstract: Substituted pyrimido[5,6-b]quinoxaline-4(3H)-one-2-carboxylic acid compounds each represented by the formula ##STR1## wherein: R designates a member selected from the group consisting of hydrogen, alkyl groups having 1 to 4 carbon atoms, benzyl group, and phenyl group; and each of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 independently designates a member selected from the group consisting of hydrogen, alkyl group having 1 to 4 carbon atoms, alkoxy groups having 1 to 4 carbon atoms, halogens, benzyloxy group, hydroxyl group, alkylthio groups having 1 to 4 carbon atoms, and alkylenedioxy groups having 1 to 4 carbon atoms and formed by the bonding of two of R.sup.1, R.sup.2, R.sup.3, and R.sup.4, or pharmacologically acceptable salts of said compounds.

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 ##STR1## 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.